25 men can finish a piece of work in 20 days working 7 hours per day. In how many days a group of 21 men will finish the work when they are working 5 hours per day if 2 men of the first group are equal to 3 men of the second group ?
Answer & explanation
Correct answer: option 3
using formula :-
M1 × D1 × H1 × E1 = M2 × D2 × H2 × E2
ratio of efficiency E1 : E2
3 : 2
25 × 20 × 7 × 3 = D2 × 21 × 5 × 2
D2 =50