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Question
Given Sara’s age today to be y years. Think of her age in the future or in the past. What will the following expression indicate?
y + 7, y − 3, `"y" + 4 1/2`, `"y" - 2 1/2`
Solution
In future
After n years from now, Sara’s age will be (y + n) years.
In past
n years ago, Sara’s age was (y − n) years.
(y + 7) represents that the person, whose age is (y + 7) years, is 7 years elder to Sara.
(y − 3) represents that the person, whose age is (y − 3) years, is 3 years younger to Sara.
`(y + 4 1/2)` represents that the person, whose age is `(y + 4 1/2)` years, is years elder to Sara.
`(y - 2 1/2)` represents that the person, whose age is `(y - 2 1/2)` years, is years younger to Sara.
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