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© examsnet.com
Question : 24
Total: 40
In an examination, a student's average marks were 63 per paper. If he had obtained 20 more marks for his Geography paper and two more marks for his History paper, his average per paper would have been 65. What were the number of papers in the examination?
12
11
10
9
Validate
Solution:
Let the total number of papers be x; then
63
x
+
20
+
2
x
=
65
⇒
63
x
+
22
=
65
x
⇒
2
x
=
22
∴
x
=
11
Hence, number of papers = 11.
© examsnet.com
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