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CDS Model Paper 3 Mathematics
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© examsnet.com
Question : 10
Total: 100
A car owner buys petrol at
₹
7.50
,
₹
8.00
and
₹
8.50
per litre for three successive years. What approximately is his average cost per litre of petrol if he spends ₹ 4000 each year ?
₹ 8
₹ 9
₹
7.98
₹
8.50
Validate
Solution:
Let average cost of petrol per litre be ₹
x
∴
x
=
12000
4000
7.5
+
4000
8
+
4000
8.5
=
12000
4000
(
1
7.5
+
1
8
+
1
8.5
)
=
3
10
75
+
1
8
+
10
85
=
3
2
15
+
1
8
+
2
17
=
6120
767
=
₹
7.98
per litre.
© examsnet.com
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