a and b finish the job in 15 days . while a , b and c can finish it in 12 days . c alone will finish the job in
"explanation : 12 = ( 15 * x ) / ( 15 + x ) 180 + 12 x = 15 x 3 x = 180 x = 60 answer : option c"
divide(multiply(12, 15), subtract(15, 12))