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Here are the solutions for questions 8, 9, and 10 on your image:

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### Question 8
The problem states:
A teacher is distributing **60 bottles of mineral water** and **100 bread rolls** evenly among students. Each student receives **at most 8 bottles of water** and **at most 4 rolls**. If the maximum number of students is **a** and the minimum is **b**, what is **a - b**?

#### Solution:
1. **Finding maximum students (a):** 
   - Each student can receive up to 8 bottles. Thus, the minimum number of students, \( a \), is \( 60 \div 8 = 7.5 \), rounded down to 7 (but with the constraint, it’s possible to make it 15).
   - Similarly,

Detailed solutions for a set of mathematics problems covering division, GCD, and modular arithmetic. These problems involve distributing items, finding GCD conditions, and identifying maximum integers that meet specific remainders.

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