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Question 6 Exercise 11.4

(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?

Answer:

(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.

"hello guys welcome back to the drum book
i'm ravan kumar working as a tutor that
leader
so today we are going to solve this
important problem so let's see what is
that here observe properly
so in the figure we have x and y
are the midpoints of so x and y are the
midpoints of
ac and bc right so now and ax
is equal to cy so ax
is equals to c by it seems so now
they're asking us to
show that ac is equals to bc okay
so ac is equals to bc now we should show
that
now one thing observed properly as they
have given ax
is equals to c by so as x
and y are midpoints right
so x and y are midpoint so now they are
we can also say that so a x
is equals to x c and then
b y is equals to yc because as they are
midpoints definitely they will divide
this total length into half and off
right so
that is why they are equal now they said
that
a x a x is equals to y c
so that means as a x so
as a x is equals to y
c we can say that y c is equals to x c
right
so y c is equal to x c because ax and yc
are equal
and in the same way b y is equals to
ax because a x and y c are again same
so now with this all measurements we can
count
we can substitute because all lengths
are equal here right
so we can say that a b sorry that is
ac is equals to b c so
i hope you have understood what i've
done here if you have any doubts please
comment below don't forget to subscribe
to this channel
thank you so much for watching this stay
tuned thank you"

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