if x is divided by 7 , the remainder is 5 . what is the remainder if 4 x is divided by 7 ?
x = 7 q + 5 4 x = 7 * 4 q + 20 4 x = 7 * 4 q + 7 * 2 + 6 4 x = 7 ( 4 q + 2 ) + 6 4 x = 7 k + 6 ( k = 4 q + 2 ) answer d
divide(divide(add(add(multiply(4, 7), const_10), const_10), 4), const_2)