Question 398798
When you reverse the digits in a certain two digit number you decrease its value by 27.
Find the number if the sum of its digits is 3?
...
let ten's digit be x
units digit be y
..
x+y = 3.................1
..
10y+x= 10x+y-27
9y-9x=-27
/9
y-x=-3...................2
add (1) & (2)
2y=-3+3
2y=0
y=0
So x = 3
The number is 30