Question

in how many days of working 8 hours each day can 12 men do the same work as 10men working 9 hours a day do in 16 days

Answer 1

Let the required number of men be x. Less days, More men (Indirect Proportion) More working hrs per day, Less men (Indirect Proportion) Days 8 : 10 Working Hrs 15 : 8 :: 12 : x => 8 x 15 x x = 10 x 8 x 12 => x = 10 x 8 x 12 / (8 x 15) => x = 8