Question
If a group of 15 boys and 10 girls can finish a task in 36
days, and a team of 5 girls alone can complete the same task in 72 days, how long will it take for 45 boys to finish the entire task on their own?Solution
ATQ;
Task done by 5 girls in 1 day = 1/72
Task done by 10 girls in 1 day = 2/72 = 1/36
Task done by 15 boys = 1/36 – 1/36 = 0
Task done by 45 boys = 5/36 = 1/7.2
Hence, required time = 7.2 days
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