16 men can paint 15 walls in 45 days. In how many days can 20 men paint 20 walls ?

40 60 48 45

48

Formula to used here, \(\frac{M_1\;×\;D_1}{M_2\;×\;D_2}\) = \(\frac{W_1}{W_2}\) where, M = No. of Men, D = No. of Days, W= Work, ⇒ Putting in the values, ⇒ \(\frac{16\;×\;45}{20\;×\;D_2}\) = \(\frac{15}{20}\) ⇒ \( { D}_{2 } \) = 48 days.