how many even integers n , such that 20 < = n < = 180 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 278 = 16 + 6 ( 27 ) there are 27 numbers in the list . the answer is b .
add(divide(subtract(subtract(180, const_2), add(20, const_2)), add(const_2, const_4)), const_1)