the sum of ages of 5 children born 3 years different each is 50 years . what is the age of the elder child ?
"let the ages of children be x , ( x + 3 ) , ( x + 6 ) , ( x + 9 ) and ( x + 12 ) years . then , x + ( x + 3 ) + ( x + 6 ) + ( x + 9 ) + ( x + 12 ) = 50 5 x = 20 x = 4 . x + 12 = 4 + 12 = 16 d"
divide(add(add(add(add(3, const_4), add(3, const_4)), add(const_4, const_4)), 50), 5)