#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