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Standard V
Mathematics
Introduction to 3D Objects
The cost of p...
Question
The cost of preparing the walls of a room 12 m long at the rate of Rs 1.35 per square metre is Rs 340.20 and the cost of matting the floor at 85 paise per square metre is Rs 91.80. Find the height of the room.
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Solution
The
cost
of
preparing
4
walls
of
a
room
whose
length
is
12
m
is
Rs
340
.
20
at
a
rate
of
Rs
1
.
35
/
m
2
.
∴
Area
of
the
four
walls
of
the
room
=
total
cost
rate
=
Rs
340
.
20
Rs
1
.
35
=
252
m
2
Also
,
the
cost
of
matting
the
floor
at
85
paise
/
m
2
is
Rs
91
.
80
.
∴
Area
of
the
floor
=
total
cost
rate
=
Rs
91
.
80
Rs
0
.
85
=
108
m
2
Hence
,
breadth
of
the
room
=
area
of
the
floor
length
=
108
12
=
9
m
Suppose
that
the
height
of
the
room
is
h
m
.
Then
,
we
have
:
Area
of
four
walls
=
2
×
(
length
×
height
+
breadth
×
height
)
⇒
252
=
2
×
(
12
×
h
+
9
×
h
)
⇒
252
=
2
×
(
21
h
)
⇒
21
h
=
252
2
=
126
⇒
h
=
126
21
=
6
m
∴
The
height
of
the
room
is
6
m
.
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