if x is equal to the sum of the integers from 50 to 70 , inclusive , and y is the number of even integers from 50 to 70 , inclusive , what is the value of x + y ?
"x = 50 + 51 + . . . + 70 = 21 ( 60 ) = 1260 y = 11 x + y = 1271 the answer is d ."
add(multiply(divide(add(50, 70), const_2), add(subtract(70, 50), const_1)), add(divide(subtract(70, 50), const_2), const_1))