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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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21 Jan 2019, 02:41
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Difficulty:

35% (medium)

Question Stats:

75% (01:38) correct 25% (01:49) wrong based on 17 sessions

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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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21 Jan 2019, 08:58
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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A student’s efficiency, E, is measured by the following formula: E = 3   [#permalink] 21 Jan 2019, 08:58
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