Question

the tens digit of a 2 digit number is twice of its unit digit on reversing the digits the number formed is 27 less ​

Answer 1

Let tens digit = X
Let unit digit = Y

1st equation
X = 2Y

2nd equation
10X + Y = 10 Y + X + 27

Now place X = 2Y in eq2

20 Y + Y = 10Y + 2 Y + 27
9 Y = 27
Y = 3 , X = 6
Ans = 63