(a) Given Munnu's age to be $ x $ years, can you guess what $ (x-2) $ may show? (Hint : Think of Munnu's younger brother.)
Can you guess what $ (x+4) $ may show? What $ (3 x+7) $ may show?
(b) 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 \frac{1}{2}, y-2 \frac{1}{2} $.
(c) Given $ n $ students in the class like football, what may $ 2 n $ show? What may $ \frac{n}{2} $ show? (Hint : Think of games other than football).
To do:
We have to answer the given questions.
Solutions:
(a) Munnu's age is \( x \) years.
$(x - 2)$ represents the age of the person who is 2 years younger than Munnu.
$(x + 4)$ represents the age of the person who is 4 years elder than Munnu.
$(3x + 7)$ represents the age of the person who is elder to Munnu and his age is 7 years more than three times the age of Munnu.
(b) Sara's age today is \( y \) years.
$(y + 7)$ represents the age of the person who is 7 years elder than Sara.
$(y - 3)$ represents the age of the person who is 3 years younger than Sara.
$y+4 \frac{1}{2}$ represents the age of the person who is $y+4 \frac{1}{2}$ years elder than Sara.
$y-2 \frac{1}{2}$ represents the age of the person who is $y-2 \frac{1}{2}$ years younger than Sara.
(c) Number of students who like football $=n$
$2n$ represents the number of students who like either football or some other game like basketball.
$\frac{n}{2}$ represents the number of students who like basketball out of the total number of students who like football.
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