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Author Topic: Little Maths Game  (Read 17655 times)

Offline Jerry

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Re: Little Maths Game
« Reply #15 on: March 21, 2012, 07:49:44 am »
5x2+3+7x0+12.5-1 = 10 + 3 + 0 + 12.5 - 1 = 24.5

Hmm, how about this one?
3, 3, 5, 4, 4, 3, 5, 5, 4, 3, 6, 6, ?
8.

Haha, nice! ^_^

Though you forgot to put a question. Does that mean the sequence was that hard? :P

Domain of f(g(h(x))) given f(x)=(9^1/2)/(2x-2)  g(x)=-5x^1/2  and f(x)=(128x^1/7)+3

Well, h is not defined, so... no solution ;D

I think you meant the last one was h, soooo:

f(g(h(x))) = f(g((128x^1/7)+3))

= f(-5((128x^1/7)+3)^1/2)

= (9^1/2)/(2(-5((128x^1/7)+3)^1/2)-2)

= -3/((100(128x^1/7)+300)^1/2+4)

Another sequence? ;D

1, 1, 2, 4, 7, 13, 24, 44, 81, ?
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Offline Arctus

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Re: Little Maths Game
« Reply #16 on: March 21, 2012, 07:55:49 am »
1, 1, 2, 4, 7, 13, 24, 44, 81, ?

Similar to the Fibonacci sequence, 1+0+0=1 1+1+0=2 2+2+1=4 4+2+1=7, etc. which makes the next number 149.
(P.S I helped DarknighT ;D)

Hmm, In an Arithmatic sequence, where the first term is 3, and the common difference is 4 what is the tenth term?

Offline Jerry

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Re: Little Maths Game
« Reply #17 on: March 21, 2012, 08:09:16 am »
Yup! ^^

a = 3
d = 4

T(10) = 3 + (10 - 1)4 = 39

Hmmm, what could I find that's not too complicated...

You start with one bacteria. Each hour, one bacteria divides into two and grow to maturity. Thus, if you have 2 initially, you'll have 4 mature ones after one hour. Each 12 hours, two thirds the total number of bacteria die (don't ask why). You start with 1 bacteria. After how much time, to the nearest hour, would you reach 1 million bacteria?
No one can go back and change a bad beginning; but anyone can start now and create a successful ending.
If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

Currently playing Pokemon XY/ORAS/Shuffle and Clash of Clans and testing out PokemonRevolutionOnline and Dragonmon Hunter....
Also, forum notification emails are not getting in my inbox... again...

Offline Mr Pokemon

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Re: Little Maths Game
« Reply #18 on: March 28, 2012, 04:44:13 am »
1 x 2 =
2 x 2 =
4 x 2 =
8 x 2 =
16 x 2 =
... this will take too long.
2^12 = 4096
2/3 of this would be about 2731 (Computer's calculator isn't very good)
After nine more hours, assuming they die on the 12th hour (you didn't specify), there would be 1398272 bacteria, the first hour the number is over 1 million.
It would take 21 hours. I think.

Assume rabbits, when they mate, produce an average of 8 offspring. It takes 3 months for each rabbit to reach the breeding age, and another 5 months for them to give birth. Half of each litter are males and half are females. Rabbits live to be 3 years old.
(Just made this up, not real facts)
If you start with a rabbit, how many months will it be before you have 5000 rabbits?

Offline Arctus

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Re: Little Maths Game
« Reply #19 on: March 28, 2012, 05:49:39 am »
Wait... so do you only start with 1 rabbit? What dies it breed with 0.o

Offline Monzta

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Re: Little Maths Game
« Reply #20 on: March 28, 2012, 06:51:29 am »
42.

1+1=

Offline Jerry

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Re: Little Maths Game
« Reply #21 on: March 28, 2012, 10:28:35 am »
1 x 2 =
2 x 2 =
4 x 2 =
8 x 2 =
16 x 2 =
... this will take too long.
2^12 = 4096
2/3 of this would be about 2731 (Computer's calculator isn't very good)
After nine more hours, assuming they die on the 12th hour (you didn't specify), there would be 1398272 bacteria, the first hour the number is over 1 million.
It would take 21 hours. I think.

Assume rabbits, when they mate, produce an average of 8 offspring. It takes 3 months for each rabbit to reach the breeding age, and another 5 months for them to give birth. Half of each litter are males and half are females. Rabbits live to be 3 years old.
(Just made this up, not real facts)
If you start with a rabbit, how many months will it be before you have 5000 rabbits?

Right! :)

And the question of yours doesn't have enough detail, such as consistency in the litter, if some are dying, or if some stop mating after a while, or after how much time some become mature to mate. That was why I posted a problem with bacteria instead XD
No one can go back and change a bad beginning; but anyone can start now and create a successful ending.
If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

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Offline BlazingApollo

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Re: Little Maths Game
« Reply #22 on: April 06, 2012, 04:36:45 pm »
Since the exam is getting near, I think it would be better to have some math exercises with you guys.
Here goes!

Say, I have thirteen sheets of money, the money I have only consists of one dollars and five dollars. How many one dollars and five dollars I have if the sum of the cash I have is fourty-one dollars?

Ah, also, did I write it correctly? (Is unfamiliar with dollar currency and English isn't my main language)


Final Examination is coming faster than I thought D:

Offline Jerry

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Re: Little Maths Game
« Reply #23 on: April 06, 2012, 09:23:23 pm »
Well, I'm not familiar with the dollars, but that's a simple simultaneous equation.

Anyone want some basic trigo question?

Prove that cos(2A) = 1- 2sin^2(A)

One of the identities you then use a lot afterwards.

Let o be the number of one dollar bill and f be the number of five dollar bill.

o + f = 13
o + 5f = 41

4f = 28
f = 7

o = 6

Number of one dollar bill = 6
Number of five dollar bill = 7
No one can go back and change a bad beginning; but anyone can start now and create a successful ending.
If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

Currently playing Pokemon XY/ORAS/Shuffle and Clash of Clans and testing out PokemonRevolutionOnline and Dragonmon Hunter....
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Offline romil89

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Re: Little Maths Game
« Reply #24 on: April 24, 2012, 07:13:22 pm »
cos2A
=cos(A+A)
=cosA.cosA - SinAsinA
=cos^2(A) - sin^2(A)
={1-sin^2(A)} - sin^2(A)
=1- 2sin^2(A)

oops forgot to add a questn... heres it...
How can you add eight 8's to get the number 1,000?
« Last Edit: April 25, 2012, 09:02:05 am by romil89 »

Offline romil89

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Re: Little Maths Game
« Reply #25 on: April 28, 2012, 07:50:44 am »
no1...??

Offline Jerry

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Re: Little Maths Game
« Reply #26 on: April 28, 2012, 05:40:00 pm »
That's because you edited a day later and there was no question before that :-\

888 + 88 + 8 + 8 + 8

Another pattern, I made up this one:
1, 2, 3, 7, 8, 17, 18, 27, ?
No one can go back and change a bad beginning; but anyone can start now and create a successful ending.
If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

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Offline romil89

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Re: Little Maths Game
« Reply #27 on: April 29, 2012, 02:45:36 pm »
Quote
That's because you edited a day later and there was no question before that
ya sry abt that... forgt to write it...

and is the ans 28 ?

Offline Jerry

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Re: Little Maths Game
« Reply #28 on: April 29, 2012, 08:53:50 pm »
Right, and any explanation for it? ;)
No one can go back and change a bad beginning; but anyone can start now and create a successful ending.
If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

Currently playing Pokemon XY/ORAS/Shuffle and Clash of Clans and testing out PokemonRevolutionOnline and Dragonmon Hunter....
Also, forum notification emails are not getting in my inbox... again...

Offline romil89

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Re: Little Maths Game
« Reply #29 on: April 30, 2012, 05:25:54 am »
Right, and any explanation for it? ;)

i jus guessed it lol :P ...