A room is 8.5 m long, 7m long and 4m heigh. it has one door measuring 1m by 1m and two windows each measuring 0.5m by 0.5 m. find the cost of painting its four walls without door and windows, if the rate of painting is ₹ 2 per square metre.
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Answer:
Area of the walls to be painted= Area of 4 faces of the room - Area of the door- Area of 2 windows
=
7
×
h
+
7
×
h
+
5
×
h
+
5
×
h
−
(
2
×
1.5
)
−
(
1.5
×
1
)
−
(
1.5
×
1
)
=
24
h
−
3
−
3
=
24
h
−
6
Area of wall painted
=
T
o
t
a
l
c
o
s
t
o
f
p
a
i
n
t
i
n
g
t
h
e
w
a
l
l
C
o
s
t
o
f
p
a
i
n
t
i
n
g
1
s
q
.
m
o
f
t
h
e
w
a
l
l
=
825
12.5
=
66
s
q
.
m
Thus,
24
h
−
6
=
66
⇒
24
h
=
72
⇒
h
=
72
24
=
3
m
Thus the height of the room is 3m.
Step-by-step explanation:
This an example . You can try your values substituting in this
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