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TIME AND WORK

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by apoorva.srivastva » Thu Aug 06, 2009 5:41 am
A is thrice as good a workman as B and takes 10 days less to do a piece of work than B takes. the number of days taken by B to finish the work is:
a) 12
b) 15
c) 20
d) 30
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by adssaini » Thu Aug 06, 2009 5:59 am
i think its 15 days, choice B. because that is the only option I see, where B is 3 times A (15 days to 5 days) and difference is of 10 days.
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by pandeyvineet24 » Thu Aug 06, 2009 8:11 am
let the number of days for B be X . Therefore, A will complete the task in X/3 days

also its given that B takes 10 more days

therefore X - X/3 = 10

solve for it gives X = 15 (number of days B takes)
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Re: TIME AND WORK

by quant-master » Thu Aug 06, 2009 9:40 am
apoorva.srivastva wrote:A is thrice as good a workman as B and takes 10 days less to do a piece of work than B takes. the number of days taken by B to finish the work is:
a) 12
b) 15
c) 20
d) 30
A does it in x days while B does it in 3x days. 3x-x =10 hence x=5

since B takes 3x days he will take 15 days to complete the work

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Quant-Master
https://gmat-quants.blocked - My Blog Updated almost daily with new quant fundas. Find collection of quants question in my blog
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