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A student’s efficiency, E, is measured by the following formula: E = 3

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A student’s efficiency, E, is measured by the following formula: E = 3  [#permalink]

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New post 21 Jan 2019, 03:41
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A student’s efficiency, E, is measured by the following formula: \(E = \frac{3t^3}{d^2}\), where t = hours spent studying and d = hours spent browsing the Internet. Yesterday, Gerald and Harry spent the same amount of time studying, but Gerald spent twice as much time browsing the Internet. Yesterday, Gerald’s efficiency was how many times greater than Harry’s?

A 2
B 3
C 4
D 7
E 8

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A student’s efficiency, E, is measured by the following formula: E = 3  [#permalink]

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New post 21 Jan 2019, 09:58
Bunuel wrote:
A student’s efficiency, E, is measured by the following formula: \(E = \frac{3t^3}{d^2}\), where t = hours spent studying and d = hours spent browsing the Internet. Yesterday, Gerald and Harry spent the same amount of time studying, but Gerald spent twice as much time browsing the Internet. Yesterday, Gerald’s efficiency was how many times greater than Harry’s?

A 2
B 3
C 4
D 7
E 8


let t =1 and d = 1
so
Gt=1 =Ht
and Gd=2 and Hd=1

using given efficiency relation
for Gerald we get E= 3/4 and Harry = 3

Gerald’s efficiency was how many times greater than Harry’s


3/4 *x = 3
x= 4
IMO C
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Re: A student’s efficiency, E, is measured by the following formula: E = 3  [#permalink]

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New post 17 Jun 2019, 08:22
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Bunuel wrote:
A student’s efficiency, E, is measured by the following formula: \(E = \frac{3t^3}{d^2}\), where t = hours spent studying and d = hours spent browsing the Internet. Yesterday, Gerald and Harry spent the same amount of time studying, but Gerald spent twice as much time browsing the Internet. Yesterday, Gerald’s efficiency was how many times greater than Harry’s?

A 2
B 3
C 4
D 7
E 8


if they spent the same about of time studying, and gerlad spent twice browsing the net. the how can gerald's E be greater than Harry's E?
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Re: A student’s efficiency, E, is measured by the following formula: E = 3   [#permalink] 17 Jun 2019, 08:22
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A student’s efficiency, E, is measured by the following formula: E = 3

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