Question

N a two digit number, digit in units place is twice the digit in tensplace. if 27 is added to it, digits are reversed. find the number.

Answer 1

let two digits number=10x+y,

y=2x,

10x+y+27=10y+x,

9y-9x=27,

y-x=3,

2x-x=3,

x=3,

then
y=2×3=6,

therefore

two digits number=10×3+6=36