a can complete a certain job in 7 days . b is 40 % more efficient than a . in how many days can b complete the same job ?
"let , total work unit = 70 units a can finish in 7 days = 70 unit work i . e . a can finish in 1 days = 10 unit work i . e . b can finish in 1 days = 10 + ( 40 / 100 ) * 10 = 14 unit work days in which b will complete the work alone = 70 / 14 = 5 days answer : option a"
divide(multiply(7, 40), const_100)