Time and Work Practice Test 5 with solutions

Question : 22 of 30

Marks: +1, -0

A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:

Solution:

(A + B)'s 4 days' work =

4(1/{15}+1/{20})

4 × 7/{60}

7/{15}

Hence, the fraction of work that is left =

1 - 7/{15}

8/{15}

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