the difference between the ages of two persons is 30 years . fifteen years ago , the elder one was twice as old as the younger one . the present age of the younger person is ?
"let their ages be x years and ( x + 30 ) years then , ( x + 30 ) - 15 = 2 ( x - 15 ) x + 15 = 2 x - 30 x = 45 answer is c"
add(subtract(30, subtract(30, add(const_3, const_2))), multiply(subtract(30, add(const_3, const_2)), const_2))