a work which could be finished in 9 days was finished 3 days earlier after 10 more men joined . the number of men employed was ?
"explanation : x - - - - - - - 9 ( x + 10 ) - - - - 6 x * 9 = ( x + 10 ) 6 x = 20 answer : b"
divide(multiply(multiply(3, const_2), 10), subtract(9, multiply(3, const_2)))