Question

Identify the number which does not satisfy: Sum of digits is a divisor of the number.

• A. 21
• B. 30
• C. 36
• D. 39

Answer 1

Answer:

D. 39

Check each number:

• 21 → sum of digits = 2 + 1 = 3; 21 ÷ 3 = 7

• 30 → sum of digits = 3 + 0 = 3; 30 ÷ 3 = 10

• 36 → sum of digits = 3 + 6 = 9; 36 ÷ 9 = 4

• 39 → sum of digits = 3 + 9 = 12; 39 ÷ 12 = 3.25

Answer: 39 (its digit sum is not a divisor of the number).