8 years ago Carlos' age was four times that of his brother. In 18 years time he will be the double his brother's age. Now, what are the present ages of Carlos and his brother?
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1 Answer
Carlos is
Explanation:
There are 3 periods of time:
past: ie
present
future: ie
There are two people: Carlos and his brother.
Carlos is older
Let Carlos' present age be
Write an expression for each person for each period of time:
Now make equations:
In the past, Carlos was
In the future, Carlos will be twice as old as his brother.
We have 2 equations in