Question

(a) Given Munnu’s age to be x years, can you guess what (x − 2) may show?

(Hint: Think of Mannu’s younger brother.)

Can you guess what (x + 4) may show? What (3x + 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?

(c) Given n students in the class like football, what may 2n show? What may show? (Hint: Think of games other than football).

Answer 1

(a)(x − 2) represents that the person, whose age is (x − 2) years, is 2 years younger to Munnu.

(x + 4) represents that the person, whose age is (x + 4) years, is 4 years elder to Munnu.

(3x + 7) represents that the person, whose age is (3x + 7) years, is elder to Munnu and his age is 7 years more than three times of the age of Munnu.

(b) 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 + ) represents that the person, whose age is (y + ) years, is years elder to Sara.

(y −) represents that the person, whose age is (y − ) years, is years younger to Sara.

(c) 2n may represent the number of students who like either football or some other game such as cricket whereas represents the number of students who like cricket, out of the total number of students who like football.