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This question belongs to Arithmetic Ability Time And Work
Time and Work
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Raju can finish a piece of work in 20 days. He worked at it for 5 days and then Jakob alone finished the remaining work in 15 days. In how many days can both finish it together?

Answer & Solution
Correct Answer: Option A
Let total work = 60 unit
Work by Raju in one day = $$\frac{{60}}{{20}}$$ = 3 unit
5 days → 5 × 3 = 15 unit
Remaining work = 60 - 15 = 45 unit
15 days → 45 unit
1 day → 3 unit (Jakob)
Work done by Raja and Jakob in one day = 3 + 3 = 6
Time = $$\frac{{60}}{6}$$ = 10 days
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