18 men can reap a filed in 35 days. For reaping the same filed in 15 days, how many men are required?
Correct option is A. 42 men
Number of days and number of men are inversely related.
Now given, $$35$$ days are required to reap a filed by $$18$$ men.
Then to reap the same field in $$15$$ days, men will be required is $$\dfrac{18}{15}\times 35=42$$.