a can complete a certain job in 18 days . b is 80 % more efficient than a . in how many days can b complete the same job ?
"let , total work unit = 180 units a can finish in 18 days = 180 unit work i . e . a can finish in 1 days = 10 unit work i . e . b can finish in 1 days = 10 + ( 80 / 100 ) * 10 = 18 unit work days in which b will complete the work alone = 180 / 18 = 10 days answer : option e"
divide(multiply(18, 80), const_100)