14 men can complete a work in 15 days. If 21 men are employed, then in how many days will they complete the same work?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 10
14 men can complete a work in 15 days.
M1 × D1 = M2 × D2 (Here, M1 = People at the 1st case, D1 = Time at the 1st case, M2 = People at the 2nd case, D2 = Time at the 2nd case)
According to the concept -
M1 = 14
D1 = 15
M2 = 21
Let D2 be x.
14 × 15 = 21 × x
210 = 21x
x = 210/21
x = 10
D2 = 10 days