The sum of the digits of a two-digit number is 7. When the digit are reversed,the numbers is increase by 27. How do you find the numbers?
2 Answers
The digits are
Explanation:
If we let the digits be
then the possible numbers composed of those two digits are
We are told
[1]
and (assuming
[2]
[2] simplifies into
[3]
or
[4]
Adding [1] and [4], we get
[5]
which implies
[6]
Substituting
we see that
[7]
The two digit number is
Explanation:
Let tens digit and units digit of the number be
The two digit number is
the two digit number becomes
Hence the two digit number is