how many multiples of 2 are there between 10 and 52 , 10 and 52 inclusive ?
"2 multiples are . . . 10,12 , 14,16 , 18,20 , 22,24 , 26,28 , 30,32 , 34,36 , 38,40 , 42,44 , 46,48 , 50,52 , . . . , the answer is = 22 answer is e"
add(divide(subtract(52, 10), 2), const_1)