If 450 men can finish construction of an apartment in 20 days, then how many men are needed to complete the same work in 30 days?

150 300 400 250

300

Men x No. of days = constant  Let the required no. of men be X Then, 450 x 20 = X x 30                     X =  \(\frac{450\; \times\; 20}{30}\)                              = 300