Question

The sum of the digit of a 2-digit 5 number
9. If the digits of the number are reverse
the new number is decreased by 9. Find the
number.​

Answer 1

Answer:

let x and y be two digits

x+y=9.....(1)

number=10x + y

After reversing the digits

10y+x=10x+y-9

9y-9x=-9

y - x = -1

x - y =1 ....(2)

Add (1) + (2)

2x=10

x=5

y= 4

number =54 Ans