Question

In a 2 digit number tens digit is twice the unit digit. If the sum of the digits is 9, find the number

Answer 1

Answer:

once place will be x then 10 place will be 2x

their number will be 10 into 2 X + x

and their sum will be 2 X + x

now according to question

2 X + x is equal to 9

3x is equal to 9

x is equal to 3

therefore one place will be 3 and 10 place will be 2 into 3 that is 6

so number will be 63

Answer 2

Suppose, the unit digit is "a".
Then the tens digit is 2a.

(2a+a)=3a=9.
or, a=3.
2a=6.
Then the number will be 63.

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