a and b finish the job in 15 days . while a , b and c can finish it in 5 days . c alone will finish the job in
"explanation : 5 = ( 15 * x ) / ( 15 + x ) 75 + 5 x = 15 x 10 x = 75 x = 7.5 answer : option d"
divide(multiply(5, 15), subtract(15, 5))