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1. It takes 10 days for 4 boys to complete a piece of work. The same work can be completed by 7 girls in 10 days. If 3 boys and 5 girls work in together, approximately how many days will they need to complete the work ?
- A. 10
- B. 10
- C. 10
- D. 10
Answer: Option C
Explanation:
Shortcut method:
T'=(x×y×T)/{(x×y')+(x'×y)}
Or,T'=(4×7×10)/(5×4)+(7×3)=6.82=7 days
(ans)
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