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Hello RS; mind helping me with my math?

 
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GARCIE
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PostPosted: Tue Jul 06, 2010 5:14 pm    Post subject: Hello RS; mind helping me with my math? Reply with quote

Here's the question

"The number of bacteria in a culture quadruples every 15 hours. How many times more bacteria are there after 30 hours than there are after 20 hours?"

This question is related to the logs section of Math 12 (BC curriculum)

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Fatchile
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PostPosted: Tue Jul 06, 2010 5:20 pm    Post subject: Reply with quote

40 TIMES? I mean.... 10x4=40. Forgive me if I answered wrong.
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Nirojan
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PostPosted: Tue Jul 06, 2010 5:23 pm    Post subject: Reply with quote

what if somehow it quadruples AT the 15 hour mark?

is it just multiplying by 2 twice spreadout throu-wait no

huh
this is confusing


WHY MATH IN THE SUMMER ANYWAYS?

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Yazu™
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PostPosted: Tue Jul 06, 2010 5:29 pm    Post subject: Reply with quote

2/3's more?
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gogodr
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PostPosted: Tue Jul 06, 2010 5:33 pm    Post subject: This post has 1 review(s) Reply with quote

x is the number of bacteria

it goes at a reason of 4x / 15 hours

so the total at time 30h should be x * 4 / 15 * 30 which is 8x
total at time 20h should be x * 4 / 15 * 20 which is (16/3)x

the reason in between them both.
How many times more bacteria are there after 30 hours than there are after 20 hours?

should be

8x / [( 16/3)x]

which is 3/2

at 30h you have 1.5 times the bacteria you had at 20h

thats your answer
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Anarchy
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PostPosted: Tue Jul 06, 2010 5:44 pm    Post subject: Reply with quote

gogodr wrote:
x is the number of bacteria

it goes at a reason of 4x / 15 hours

so the total at time 30h should be x * 4 / 15 * 30 which is 8x
total at time 20h should be x * 4 / 15 * 20 which is (16/3)x

the reason in between them both.
How many times more bacteria are there after 30 hours than there are after 20 hours?

should be

8x / [( 16/3)x]

which is 3/2

at 30h you have 1.5 times the bacteria you had at 20h

thats your answer
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GARCIE
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PostPosted: Tue Jul 06, 2010 5:47 pm    Post subject: Reply with quote

kk i got it, it's not 1.5 times greater, thanks gogodr though, you set me on the right track

the answer is 2.5 times greater

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