Question

pls help me to solve this...

Answer 1

Let the units digit be y and tens digit is x.
Then the number can be represented as 10x +y.
Given, x + 7 = y                                               (1)
And, x+y=1/9(10x+y)                                       (2)

From (1) and (2),

y+y+7=1/9[10(y+7)+y]
or, 2y+7=1/9(11y+70)
or, 18y+63=11y+70
or, 7y=7
or, y=1
or, x=1+7=8.

∴ The number is 81.

Answer 2

so the number will be (10x+y) = (10×-8 + (-1))
= -81


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