Question
In an examination the average marks of Rohit is 60. If he got 21 more marks in science and 35 more marks in maths then his average would have been 68. Find the total number of subjects he studied?
Solution
Let total number of subjects be x. Then, => (60x + 35 + 21)/x = 68 => 60x + 35 + 21 = 68x => 8x = 56 => x = 7
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