Instructions
Each of these has a question folowed by two statements numbered I and II.
Question 93
What is the weighted averaged of marks obtained by Ashokan?
I. Math, Science and English have weights 5, 4 and 3 respectively.
II. Simply arithmetic mean of math and science is 140, which is twice his average of science and English
Solution
From (ii),
$$\Rightarrow$$ (M + S)/2 = 140
$$\Rightarrow$$ M + S = 280 and
$$\Rightarrow$$ S + E = 140
We cannot find values of his marks obtained from the above two equations and from (i) only weights of the subjects are given.
To find the weighted average we need both weights and values of the subjects. So from (i) and (ii) we cannot solve the question.
Hence, option D is the correct answer.
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