SSC CGL Model Paper 19

Question : 57 of 100

Marks: +1, -0

'A' and 'B' promised to complete a work for Rs. 275. 'A' alone can do this work in 7 months and 'B' alone can do this work in 13 months. With the help of 'C', all three can completed the work in 3 months. 'C' can complete the work in how many days (consider the last month is of 31 days).

8 months and 15 days
8 months and 25 days
8 months and 10 days
8 months

Validate

Solution:

1/13+1/7+1/C=1/3

⇒1/C={91-21-39}/{3×13×7}

C can do the work in

={13×7×3}/31

=273/31\months

=8 25/31\months

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