Question -
How do we check if 87 is divisible by 3?
Options:
A .  Check if the units place is odd or even.
B .  Check if the units place is 3, 6 or 9.
C .  Check if the sum of the digits is 9.
D .  Check if the sum of digits is divisible by 3.
Answer: Option D : D A number is divisible by 3 if the sum of its digits is divisible by 3. Sum of the digits of 87 = 8+7=15 15 is divisible by 3. Hence, 87 is also divisible by 3.
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