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Algebra
Level
pending
In an examination, a pupil's average marks was 63 per paper. If a man had obtained 20 more marks for his Geography paper and 2 more marks for his History paper. His average per paper would have been 65. How many paper are there?
The answer is 11.
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1 solution
Let the number of papers = X;
Average of X papers = 63;
Then total mark = 63 x X;
Given he obtained 20 more in geography and 2 more marks in History;
The new average is = 65;
To find out the number of papers = 63X + 20 + 2 = 65X;
= 22 = 2(X);
X = 11