15 men can complete a task in 10 days. In how many days can 20 men complete the same task?

6.5 days 7.5 days 5.5 days 8.5 days

7.5 days

Formula to be used here, \( { M}_{1 } \) x \( { D}_{1 } \)  = \( { M}_{2 } \) x \( { D}_{2 } \) where, M = No. of Men, D = No. of Days, ⇒ Putting values in the formula, ⇒ 15 x 10 = 20 x \( { D}_{2 } \) ⇒ \( { D}_{2 } \) = 7.5 days.