What is the least value of x. So that 21x57 is divisible by 3.	Choose the correct option.
A) 2
B) 0
C) 1
D) 3
E) 4
Explanation:   The sum of the digits of the number is divisible by 3, then the number is divisible by3.   2 + 1 + x + 5 + 7 = 15 + x   Least value of x may be 0   Therefore  15 + 0= 
<gadget id="calculator"> 15 + 0</gadget>
<output>15</output>
15 is divisible by 3.   Answer: Option 0
<result>B</result>
What is the least value of x. So that 21x57 is divisible by 3.