In a Maths test the average score of the 10 girls in a class is 15 and the average score of the 15 boys is 10. The average score of the class in the test is
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Step-by-step explanation:
Totally there are 25 students and the average of 25 students in maths is 90 , so total score obtained is 90×25.
Average score of girls is x , total score obtained by girls will be 15×x
Therefore, total score obtained by boys is 90×25−15×x
Average score is
10
(90×25−15×x)
=225− 3/2x
225-3/2x is correct answer
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