Question
In an examination, a student has an average score of 84.
If he had scored 14 more marks in Science and 19 more marks in English, his average would increase to 89.5. How many subjects did he study in total?Solution
Let he studies total number of subjects = n His total marks = 84n In second condition- (84n + 14 + 19)/n = 89.5 84n + 33 = 89.5n 5.5n = 33 n = 6 He studies a total number of 6 subjects.
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