Arithmetic Ability
Time and Work

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Q.

9 men and 12 boys finish a job in 12 days, 12 men and 12 boys finish it in 10 days. 10 men and 10 boys shall finish it in how many days ?

View Answer

Correct choice: D

Explanation:

9M + 12B ----- 12 days ...........(1) 12M + 12B ------- 10 days........(2) 10M + 10B -------? 108M + 144B = 120M +120B 24B = 12M => 1M = 2B............(3) From (1) & (3) 18B + 12B = 30B ---- 12 days 20B + 10B = 30B -----? => 12 days.
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