Exams › SSC CGL (Prelims) › General
X can do a job in 10 days, and Y can do it in 15 days. They work together for 4 days. What fraction of the work remains?
- 1/6
- 1/5
- 1/4
- 1/3
Correct answer: 1/3
Solution
X's one-day work is $1/10$ and Y's one-day work is $1/15$. Together they do $1/10 + 1/15 = 1/6$ of the work per day, so in 4 days they complete $4/6 = 2/3$ of the work. Therefore, the remaining work is $1 - 2/3 = 1/3$.
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