Question

The average score of three boys in
Mathematics is 30. When the score of a
fourth boy is added to the total score of the
three boys, the average is lowered to 25.
What is the score of the fourth boy?​

Answer 1

Answer:

The total score of the first three boys = 3*30 = 90. The total score of the four boys = 4*25 = 100. So the score of the 4th boy was 100–90 or 10 marks.

Explanation:

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