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

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Math Expert
Joined: 02 Sep 2009
Posts: 58434
A student’s efficiency, E, is measured by the following formula: E = 3  [#permalink]

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21 Jan 2019, 03:41
00:00

Difficulty:

25% (medium)

Question Stats:

79% (01:39) correct 21% (01:52) wrong based on 47 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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Concentration: Sustainability, Marketing
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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, 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
Intern
Joined: 10 Oct 2017
Posts: 24
GMAT 1: 610 Q41 V35
Re: A student’s efficiency, E, is measured by the following formula: E = 3  [#permalink]

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17 Jun 2019, 08:22
1
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?
Re: A student’s efficiency, E, is measured by the following formula: E = 3   [#permalink] 17 Jun 2019, 08:22
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