Question 772368
A two digit number, whose sum of digits is ten, will be 36 less than the original number when the digits are reversed. What is the original number?
***
let u=units digit
let t=tens digit
u+t=10
u=10-t
..
10t+u=10u+t+36
10t+10-t=10(10-t)+t+36
10t+10-t=100-10t+t+36
10t+10-t=100-10t+t+36
18t=126
t=7
u=10-t=3
original number=73