a and b finish the job in 15 days . while a , b and c can finish it in 10 days . c alone will finish the job in
"explanation : 10 = ( 15 * x ) / ( 15 + x ) 150 + 10 x = 15 x 5 x = 150 x = 30 answer : option b"
divide(multiply(10, 15), subtract(15, 10))