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# How would you computer this quickly?

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Director
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How would you computer this quickly? [#permalink]

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14 Apr 2008, 10:15
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

So (90/v-3) - (90/v-3) = 1/2

Solve for v...
CEO
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Re: How would you computer this quickly? [#permalink]

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14 Apr 2008, 11:46
Jimmyjamesdonkey, I guess there is a typo in your question.

maybe you would like to write following:
$$\frac{90}{v-3} - \frac{90}{v+3} = \frac12$$
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Re: How would you computer this quickly? [#permalink]

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14 Apr 2008, 14:23
I agree with walker..the stem as you wrote ends up 0=1/2 ..

if Walker's statement is true..

basically..

i multiply both sides by (v-3)/(v-3)*(v+3)/(v+3)

the stem reduces to $$\frac{90(v+3)}{v^2-3^2} -\frac{90(v-3)}{v^2-3^2}=1/2$$

above equation reduces to 1089=v^2..roughly ~1024=which means v=2^5 or 32

walker wrote:
Jimmyjamesdonkey, I guess there is a typo in your question.

maybe you would like to write following:
$$\frac{90}{v-3} - \frac{90}{v+3} = \frac12$$
Re: How would you computer this quickly?   [#permalink] 14 Apr 2008, 14:23
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