SSC CGL Tier II 21 Sep 2014 Paper

Question : 59 of 100

Marks: +1, -0

A, B and C can do a job in 6 days, 12 days and 15 days respectively. After

1/ 8

of the work is completed, C leaves the job. Rest of the work is done by A and B together. Time taken to finish the work is

Solution:

(3) Remaining work

=1-1/8=7/8

(A + B)’s 1 day’s work

= {1}/{6}+ {1}/{12}= {2+1}/{12}= {3}/{12}= {1}/{4}

∴ Time taken in doing

7/8

part of work

= {7}/{8}× 4= {7}/{2} = 3 1/2

days

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