Question
If a group of 10 boys and 15 girls together can finish a
task in 30 days, and a team of 5 girls alone can complete the same task in 120 days, how long will it take for 60 boys to complete the entire task on their own?Solution
ATQ;
Task done by 5 girls in 1 day = 1/120
Task done by 15 girls in 1 day = 3/120 = 1/40
Task done by 10 boys = 1/30 – 1/40 = 1/120
Task done by 60 boys = 6/120 = 1/20
Hence, required time = 20 days
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