Assuming that the two actions are independently done,
g-8 = 3/4 b
b-8 = 11/10 g
solve for b and g, and then you want b+g to get the total students who started out seated. (That does not count any who might not have been seated to start with, but were in the auditorium.)
There are some pupils seated in the auditorium. When 8 girls stand up, the number of girls who are seated becomes 3/4 of the number of boys who are seated. When 8 boys stand up, the number of boys who are seated becomes 11/10 of the number of girls who are seated. How many pupils are there in the auditorium?
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