Question

a number consists of two digits whose sum is 7 if 9 is added to the number the digits change their places then the value is ​

Answer 1

Answer:

Let the number be xy

x + y = 7

Possible combinations are (0,7) (1,6) (2,5) (3,4)

But xy + 9 = yx

(3,4) satisfies this condition.

Since 34 + 9 = 43

So the value of the number is 34

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