Good day everyone. I have a big conundrum here and I urgently need your help:
There is a solution that starts with this:
Let
be tens digit and
be the units digit of the original number.
Original number is
and the sum of its digits is
.
Number formed by reversing its digits =
.
I can comprehend what it's trying to elucidate on, however, I still do not know
- what is the meaning of the units digit
- what is the purpose of having a 10 in the algebraic expressions and
Can you please help me explain? Thank you so much!