It says it clearlyit says it must include appetizers a main course dessert beverage and water
(x + 5) + (2x + 3)
Because 2x + x = 3x and 5 + 3 = 8:
3x + 8
5/4 = 75/x....5 in art to 7 in gym = 75 in art to x in gym
cross multiply
5x = 300
x = 300/5
x = 60..... according to 2nd semester, there are 75 in art and 60 in gym....total of (75 + 60) = 135 total students in the two classes.
so in 1st semester, the ratio was 2:7....added = 9
2/9(135) = 270/9 = 30 in art class <==1st semester art
7/9(135) = 945/9 = 105 in gym class <== 1st semester gym