if x is equal to the sum of the integers from 20 to 40 , inclusive , and y is the number of even integers from 20 to 40 , inclusive , what is the value of x + y ?
"x = 20 + 21 + . . . + 40 = 21 ( 30 ) = 630 y = 11 x + y = 641 the answer is e ."
add(multiply(divide(add(20, 40), const_2), add(subtract(40, 20), const_1)), add(divide(subtract(40, 20), const_2), const_1))