SSC CGL 9 Aug 2015 Shift 2 Paper

Question : 149 of 200

Marks: +1, -0

A can do a work in 10 days and B in 20 days. If they together work on it for 5 days, then the fraction of the work that is left is

Solution:

Work done by A and B in 1 day
=

1/{10}+1/{20}

{2+1}/{20}

3/{20}

∴ (A + B)’s 5 days’ work
=

{5×3}/{20}

3/4

∴ Remaining work
= 1 -

3/4

1/4

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