how many even integers n , such that 20 < = n < = 220 are of the form 3 k + 4 , where k is any natural number ?
"the first number is 22 = 16 + 6 ( 1 ) . we can continue adding 6 to make a list : 22 , 28 , 34 , . . . the last number is 220 = 16 + 6 ( 34 ) there are 34 numbers in the list . the answer is c ."
add(divide(subtract(subtract(220, const_2), add(20, const_2)), add(const_2, 4)), const_1)