Correct Answer - Option 3 : 28 days
Formula used:
Time is taken = Total work/Efficiency
Calculation:
As, 14 workers can construct a wall in 20 days
So, 1 worker construct a wall in 20 × 14 = 280 days
⇒ 20 works construct a wall in \({280 \ \over 20}\)= 14 days
⇒ 20 workers construct 2 such walls in 14 × 2 = 28 days
∴ 20 workers construct 2 walls in 28 days.
