Given Sara’s age today to be $y y e a r s$ . Think of her age in the future or in the past. What will the following expression indicate?
$y - 2 \frac{1}{2}$

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Solution

As it is given that, Sara’s age today to be $y y e a r s$ .
$y - 2 \frac{1}{2}$ represents Sara’s age $2 \frac{1}{2}$ years in the past.

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