Answer:
16
Step-by-step explanation:
To solve, we can use an equation finding the average of the siblings'ages.

Answer:
x=6, y=2
Step-by-step explanation:
Answer:
1. x=7
2.x=6
3.x= -1/2
4.x=3
5.x=-18
6.x= -8/5
7. x=60
8. x=-3
9. x=3
10. x=0
Step-by-step explanation:
did them as fast i could
205×3/100=6.15
Total students
205-6.15=198.85
we do not use decimal numbers
198.89=199 students