Q3 of 41 Page 235

Given n students in the class like football, what may 2n show? What may show ?

Here,


According to the question,


We can conclude that,


2n may represent the number of person who either likes 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 either football or cricket.


More from this chapter

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3

Given Munnu’s age to be x years, can you gues what (x – 2) may show?

Can you gues what x + 4 may show? What (3x+7) may show?

 3

Given Sara’s age today to be y years. Think of her age in the future or in the past. What will the following expressions indicate?

Y + 7, y – 3, y + 4, y – 2

 1

State which of the following are equations (with a variable). Give reason for your answer. Identify the variable from the equations with a variable.

(a) 17 = x + 7


(b) (t-7) > 5


(c) = 2


(d) 7 × 3 – 19 = 8


(e) 5 × 4 – 8 = 2x


(f) x – 2 = 0


(g) 2m< 30


(h) 2n + 1 = 11


(i) 7 = (11×5) – (12×4)


(j) 7 = (11×2) + p


(k) 20 = 5y


(l) < 5


(m) z + 12 > 24


(n) 20 – (10-5) = 3×5


(o) 7 – x = 5

 2

Complete the entires in the third column of the table.















S.No.



Equation



Value of variable



Equation satisfied Yes/No



(a)


(b)


(c)


(d)


(e)


(f)


(g)


(h)


(i)


(j)


(k)


(l)


(m)


(n)


(o)


(p)


(q)



10y=80


10y=80


10y=80


4l=20


4l=20


4l=20


b+5=9


b+5=9


b+5=9


h-8=5


h-8=5


h-8=5


p+3=1


p+3=1


p+3=1


p+3=1


p+3=1



Y=10


Y=8


Y=5


l=20


l=80


l=5


b=5


b=9


b=4


h=13


h=8


h=0


p=3


p=1


p=0


p= - 1


p= -2