Question

Ex 7: If 30 men working 7 hrs a day can do a piece of work in 18 days, in
how many days will 21 men working 8 hrs a day do the same piece
of work?​

Answer 1

Step-by-step explanation:

for these problems follow the formulae ((M1)*(D1)*(H1))/(W1)= ((M2)*(D2)*(H2))/(W2)

WHERE M- men or women

H- hours

D-days

W- work

here work is same .therefore W1=W2

M1*D1*H1=M2*D2*H2

30*7*18=21*8*x

implies X=22.5 days