what is the least value of x . so that 21 x 57 is divisible by 3 .
"explanation : the sum of the digits of the number is divisible by 3 , then the number is divisible by 3 . 2 + 1 + x + 5 + 7 = 15 + x least value of x may be 0 therefore 15 + 0 = 15 is divisible by 3 . answer : option b"
divide(divide(divide(lcm(21, 57), 57), const_4), const_4)