the sum of ages of 4 children born 4 years different each is 48 yrs . what is the age of the elder child ?
"let the ages of children be x , ( x + 4 ) , ( x + 8 ) , ( x + 12 ) years . then , x + ( x + 4 ) + ( x + 8 ) + ( x + 12 ) = 48 4 x = 24 x = 6 x + 12 = 6 + 12 = 18 answer : e"
divide(add(add(add(add(4, const_4), add(4, const_4)), add(const_4, const_4)), 48), 4)