the sum of ages of 4 children born 2 years different each is 40 yrs . what is the age of the elder child ?
"let the ages of children be x , ( x + 2 ) , ( x + 4 ) , ( x + 6 ) years . then , x + ( x + 2 ) + ( x + 4 ) + ( x + 6 ) = 40 4 x + 12 = 40 = > 4 x = 28 x = 7 x + 6 = 7 + 6 = 13 answer : a"
divide(add(add(add(add(2, const_4), add(2, const_4)), add(const_4, const_4)), 40), 4)