14 men can build a 55 m long wall in 5 days. What length of a similar wall can be built by 21 men in 4 days?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 66 m.
We know that,
(M1 × D1 × H1)/W1 = (M2 × D2 × H2)/W2
where, M = Men, D = Days, H = hours, and W = work done
Now, according to the question
⇒ (14 × 5)/55 = (21 × 4)/W2
⇒ 14/11 = (21 × 4)/W2
⇒ 2/11 = (3 × 4)/W2
⇒ W2 = (3 × 4 × 11)/2
⇒ W2 = (3 × 2 × 11)
⇒ W2 = 66 m