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Standard X
Mathematics
Similar Figures
A swimming po...
Question
A swimming pool is 20 m long 15 m wide and 3 m deep. Find the cost of repairing the floor and wall at the rate of Rs 25 per square metre.
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Solution
Length
of
the
swimming
pool
=
20
m
Breadth
=
15
m
Height
=
3
m
Now
,
surface
area
of
the
floor
and
all
four
walls
of
the
pool
=
(
length
×
breadth
)
+
2
×
(
breadth
×
height
+
length
×
height
)
=
(
20
×
15
)
+
2
×
(
15
×
3
+
20
×
3
)
=
300
+
2
×
(
45
+
60
)
=
300
+
210
=
510
m
2
The
cost
of
repairing
the
floor
and
the
walls
is
Rs
25
/
m
2
.
∴
The
total
cost
of
repairing
510
m
2
area
=
510
×
25
=
Rs
12750
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