how many even multiples of 15 are there between 149 and 301 ?
"150 = 10 * 15 300 = 20 * 15 the even multiples are 15 multiplied by 10 , 12 , 14 , 16 , 18 , and 20 for a total of 6 . the answer is b ."
add(divide(subtract(301, 149), multiply(15, const_2)), const_1)