SOLUTION: Ali's age is between 10 and 30. Currently, Ali's age is two digits and is a multiple of 4. In the following year, his age is a multiple of 5. How old is Ali?

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Question 1078011: Ali's age is between 10 and 30. Currently, Ali's age is two
digits and is a multiple of 4. In the following year, his age
is a multiple of 5. How old is Ali?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
Ali's age is between 10 and 30. Currently, Ali's age is two
digits and is a multiple of 4...
Ali is either 12,16,20,24, or 28
In the following year, his age is...
In the following year his age is either 13,17,21,25, or 29.
...a multiple of 5.
So in the following year he will be 25, for 25 is the only 
one of those which is a multiple of 5
How old is Ali?
Ali is 24.

Edwin