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Bunuel
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20 beavers, working together in a constant pace, can build a dam in 3 11 Jul 2016, 12:39
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84% (01:00) correct 16% (01:39) wrong based on 165 sessions

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20 beavers, working together in a constant pace, can build a dam in 3 hours. How many hours will it take 12 beavers that work at the same pace, to build the same dam?

A. 2.
B. 4.
C. 5.
D. 6.
E. 8.
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C
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20 beavers, working together in a constant pace, can build a dam in 3 11 Jul 2016, 13:30
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rate of one beaver=1/(20*3)=1/60
1/(12*1/60)=5 hours
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20 beavers, working together in a constant pace, can build a dam in 3 11 Jul 2016, 13:35
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C. 5 hrs
If there were 10 beavers it qould have taken double= 6hrs.. so closest to that option is 5.

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20 beavers, working together in a constant pace, can build a dam in 3 13 Jul 2016, 16:57
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Bunuel
20 beavers, working together in a constant pace, can build a dam in 3 hours. How many hours will it take 12 beavers that work at the same pace, to build the same dam?

A. 2.
B. 4.
C. 5.
D. 6.
E. 8.
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Total Work = 20*3= 60 Beaverhours
12 Beaver * x =60 Beaverhours
x=60/12=5
Option C
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20 beavers, working together in a constant pace, can build a dam in 3 02 Aug 2016, 21:15
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For these types of problems, you don't want to waste time. The most efficient way to solve this IMO
is \(20(3)=12(x).\)

Dividing both sides by 4 we obtain \(5(3)=3(x)\).

Hence, x is 5.
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20 beavers, working together in a constant pace, can build a dam in 3 05 Feb 2024, 08:28
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