Question from Ethan

1 Nov

Q.

The average number of sit-ups performed by 15 girls and some boys was 50.
The average number of sit-ups performed by the girls was 80% of the average number of sit-ups performed by all the pupils.
The average number of sit-ups performed by the boys was 30% more than the average number of sit-ups performed by the girls.

(a) What was the average number of sit-ups performed by the girls?
(b) What percentage of the pupils were boys?

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