Question
A student scored marks with a certain average in the
first 12 tests. In the next 6 tests, he scored with an average of 78 marks, due to which his overall average increased by 4 marks. What was his average in the first 12 tests?Solution
Let, average marks in first 12 tests is x So, (12 × x + 6 × 78)/18 = x + 4 Or, 12x + 468 = 18x + 72 Or, 6x = 396 Or, x = 66
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