Find the digit x (0–9) that makes the number 4×27 divisible by 9.
Note
A number is divisible by 9 if the sum of its digits is a multiple of 9. 4 + x + 2 + 7 = 13 + x; setting 13 + x = 18 gives x = 5, which makes the sum 18, divisible by 9.
Find the digit x (0–9) that makes the number 4×27 divisible by 9.
A number is divisible by 9 if the sum of its digits is a multiple of 9. 4 + x + 2 + 7 = 13 + x; setting 13 + x = 18 gives x = 5, which makes the sum 18, divisible by 9.