a number whose fifth part increased by 4 is equal to its fourth part diminished by 10 , is :
let the number be x . then , ( ( 1 / 5 ) x + 4 ) = ( ( 1 / 4 ) x − 10 ) < = > x / 20 < = > x = 14 * 20 = 280 . answer : d
divide(add(10, 4), subtract(divide(const_1, const_4), divide(const_1, add(const_1, const_4))))