Answer:
x+y=24 so we can say
x=24-y making 3x+5y=100 become
3(24-y)+5y=100
72-3y+5y=100
72+2y=100
2y=28
y=14, since x=24-y
x=10
So there are 10 3-point questions and 14 5-point questions.
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Answer: 4ab+10b
2.5ab+14b+1.5b-4
4ab+14b-4b
4ab+10b
69 because 43 cups is 3 cups of rides in crack