Find out a number which is less than 100 and is more than one fifth of its actual value when the digits are reversed?

Answer 1

45

If we reverse the 45 we get 54 which is 20% more then 45.

Working
Assume number is 10a+b
5(10b+a) = 6(10a+b)
50b+5a=60a+6b
44b = 55 a
4b=5a where both a,b is greater then 0 and less then 9
i.e. a=4 and b=5

Answer 2

the numbers are ;;;

15, 25 , 35, 45, 55, 65, 75, 85 , 95