SSC CGL 7 06 2019 Shift 2 Paper

Question : 67 of 100

Marks: +1, -0

The ratio of the efficiencies of A, B and C is 7 : 5 : 8. Working together, they can complete a piece of work in 42 days. B and C worked together for 21 days and the remaining work was completed by A alone. The whole work was completed in:

96 days
99 days
102 days
93 days

Validate

Solution:

Total work

=(7+5+8) \×42

=20 \×42=840

Work done by

\ {B}+\ {C}=(5+8) \×21

=13 \×21=273

Remaining work

=840-273

=567

Done by

A=\ {567}/{7}=81

days
Total days

=81+21=102

days

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