1.

The sum of the digits of a two digit number is 9. Also, nine times this number is twice thenumber obtained by reversing the order of the digits. Find the number.

Answer»

Let tens digit no.be X and unit digit no.be YA/qx+y=9and 9 (10×x+y)=2 (10×y+x)90x+9y=20y+2x88x-11y=0from 1st11x+11y=9988x-11y=0......99x=99x=1and y=8 hence the no.is 18

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