what is the leastvalue of x . so that 23 x 57 is divisible by 3 ?
the sum of the digits of the number is divisible by 3 , then the number is divisible by 3 . 2 + 3 + x + 5 + 7 = 17 + x least value of x may be 1 therefore 17 + 1 = 18 is divisible by 3 . c
subtract(3, reminder(add(add(add(floor(divide(23, const_10)), reminder(23, const_10)), floor(divide(57, const_10))), reminder(57, const_10)), 3))