NCERT Solutions Class 6 Mathematics Solutions for Exercise 11.4 in Chapter 11 - Algebra
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(a) Given Munnu’s age to be x years, can you guess what (x – 2) may show?
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? 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 2n shows? What may n / 2 show?
(a) (x – 2) represents the person whose age is (x – 2) years and he is 2 years younger to
Munnu
(x + 4) represents the person whose age is (x + 4) years and he is 4 years elder than
Munnu
(3x + 7) represents the person whose age is (3x + 7) years, elder to Munnu and his age is
7 years more than the three times of the age of Munnu
(b) In Future
After n years since now, Sara’s age will be (y + n) years
In past
n years ago, Sara’s age was (y – n) years
(y + 7) represents the person whose age is (y + 7) years and is 7 years elder to Sara
(y – 3) represents the person whose age is (y – 3) years and is 3 years younger to Sara y+4 \frac{1}{2} represents the person whose age is y+4 \frac{1}{2} years and is 4 \frac{1}{2} years elder to Sara
y-2 \frac{1}{2} represents the person whose age isy-2 \frac{1}{2} years and is2\frac{1}{2} years younger to Sara
(c) 2n shows the number of students who like either football or some other game like tennis whereas n / 2 shows the number of students who like tennis out of the total number of students who like football.
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