Question
In an examination the average marks of Rohit is 54. If
he got 18 more marks in science and 22 more marks in maths then his average would have been 58. Find the total number of subjects he studied?Solution
Let total number of subjects be x. Then, => (54x + 22 + 18)/x = 58 => 54x + 22 + 18 = 58x => 4x = 40 => x = 10
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