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1. A two-digit number has 3 in its unit digit. The sum of its digits is one-seventh of the number itself. What is the number?
- A. 73
- B. 73
- C. 73
- D. 73
Answer: Option B
Explanation:
Let the decimal placed digit be X.
Then the number is (10X + 3).
Again, X + 3 = (10X + 3) / 7
or, 7X + 21 = 10X + 3
or, 10X - 7X = 21 - 3
or, 3X = 18
or, X = 6
So, the number is 63.
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