two - fifth of one - third of 3 - seventh of a number is 15 . what is 40 % of that number ?
explanation : let the number be x . then , 2 / 5 of 1 / 3 of 3 / 7 of x = 15 = > x = ( 15 * 5 / 3 * 3 * 5 / 2 ) = 525 / 2 40 % of 525 / 2 = ( 40 / 100 * 525 / 2 ) = 105 answer is e
multiply(divide(15, multiply(multiply(divide(const_2, divide(15, 3)), divide(const_1, const_4)), divide(const_3, add(const_3, const_4)))), divide(40, const_100))