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22 Jun 2017, 12:36
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If Jose does GMAT word problems at a constant rate of 2 problems every 5 minutes, how many seconds will it take him to do N problems?
(A) 0.4N
(B) 2N
(C) 2.5N
(D) 24N
(E) 150N
(A) 0.4N
(B) 2N
(C) 2.5N
(D) 24N
(E) 150N
22 Jun 2017, 12:40
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If he does 2 problems in 5 mins, 1 problem will take Jose 2.5 or 5/2 minutes
Hence N problems will take 5N/2minutes or 150N seconds(because 1 minute = 60s) (Option E)
Hence N problems will take 5N/2minutes or 150N seconds(because 1 minute = 60s) (Option E)
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22 Jun 2017, 12:45
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Vardan95
If Jose does GMAT word problems at a constant rate of 2 problems every 5 minutes, how many seconds will it take him to do N problems?
(A) 0.4N
(B) 2N
(C) 2.5N
(D) 24N
(E) 150N
(A) 0.4N
(B) 2N
(C) 2.5N
(D) 24N
(E) 150N
5 minutes \(= 5 * 60 = 300\) seconds
Jose does 2 questions per 300 seconds \(= \frac{2}{300}\) --------- (i)
Let x be time Jose can do N questions \(= \frac{N}{x}\) ------------- (ii)
Equating (i) and (ii), we get;
\(\frac{2}{300} = \frac{N}{x}\)
\(\frac{1}{150} = \frac{N}{x}\)
\(x = 150N\). Answer (E) ...
