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06 Nov 2019, 02:21
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Difficulty:
35%
(medium)
Question Stats:
69% (01:47) correct
31%
(02:15)
wrong
based on 309
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Not Attempted Yet
X and Y, two computer engineers, built identical websites at different constant rates. X, working alone for 7 hours, built some of the website; then Y, working alone for 6 hours, built the rest of the website. How many hours would it have taken X, working alone, to build all of the website?
(1) X built one part 15 minutes
(2) X built four times as many parts in 7 hours as Y built in 6 hours
Are You Up For the Challenge: 700 Level Questions
(1) X built one part 15 minutes
(2) X built four times as many parts in 7 hours as Y built in 6 hours
Are You Up For the Challenge: 700 Level Questions
06 Nov 2019, 06:10
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Assume X built x number of websites in 7 hours, and Y built y in 6 hours.
We want to calculate \(\frac{7(x+y)}{x}\)
Statement 1
x=\(\frac{7}{0.25}\), but we have no idea about y
Insufficient
Statement 2
x=4y
\(\frac{7(x+y)}{x}= \frac{7(4y+y)}{4y}= \frac{35}{4}\)
Sufficient
We want to calculate \(\frac{7(x+y)}{x}\)
Statement 1
x=\(\frac{7}{0.25}\), but we have no idea about y
Insufficient
Statement 2
x=4y
\(\frac{7(x+y)}{x}= \frac{7(4y+y)}{4y}= \frac{35}{4}\)
Sufficient
Bunuel
08 Mar 2020, 04:19
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nick1816
Shouldn't it be (7x+6y)/x ??
