a can finish a work in 18 days and b can do the same work in half the time taken by a . then , working together what part of the same work they can finish in a day ?
1 days work of a + b = ( 18 + 9 ) / 18 * 9 = 1 / 6 answer is c
add(divide(const_1, 18), divide(const_1, divide(18, const_2)))