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Number Patterns/Relations

The sum of di...

Question

The sum of digits of a two-digit number is 9. The digit at ten's place is twice the digit at unit's place. Then the number is

A

36

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B

54

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C

63

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D

45

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Solution

The correct option is C
63

Let the digit at unit's place be x

Then digit at ten's place = 2x

Sum of digits, 2x + x = 9

or 3x = 9

x = 3

Thus, the number is 63.

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