24 persons can do a piece of work in 20 days. In how many days can 30 persons do the same work?

16 14 18 12

16

Formula to be used, \( { M}_{1 } \) x \( { D}_{1 } \)  = \( { M}_{2 } \) x \( { D}_{2 } \) where, M = No. of Men, D = No. of Days, ⇒ Putting values in the formula, ⇒ 24 x 20 = 30 x \( { D}_{2 } \) ⇒ \( { D}_{2 } \) = 16 days.