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The problem states that Mr. Ng bought 25 mini chocolate bars for his students. The Mars mini chocolate bars cost $0.30 each, while the Reese mini chocolate bars cost $0.45 each. The total cost of the Reese mini chocolate bars was $9.45.

Here's the step-by-step breakdown:

1. **(a) Form an expression in $ x $:**
   - Let $ x $ represent the number of Mars mini chocolate bars.
   - Since Mr. Ng bought a total of 25 bars, the number of Reese mini chocolate bars would be $ 25 - x $.
   - The total cost of the Mars mini chocolate bars is $ 0.30x $ dollars.
   - The total cost of the Reese mini chocolate bars is $ 0.45(25 - x) $ dollars.
   - The expression for the total cost is:  
     \[
     0.30x + 0.45(25 - x)
     \]

2. **(b) Solve for $ x $:**
   - We know that the total cost of the Reese mini chocolate bars is $9.45.
   - So, we set up the equation:
     \[
     0.45(25 - x) = 9.45
     \]
   - Solve this equation for $ x $.

Let's go ahead and solve for $ x $.The solution to the equation is $ x = 4 $. 

This means Mr. Ng bought 4 Mars mini chocolate bars. Since he purchased a total of 25 bars, the remaining $ 25 - 4 = 21 $ were Reese mini chocolate bars.

Would you like more details or have any questions? 

Here are 5 related questions to explore further:
1. How much did Mr. Ng spend on the Mars mini chocolate bars?
2. What is the total cost of all 25 chocolate bars?
3. How would the equation change if the cost of Mars mini chocolate bars was different?
4. What if Mr. Ng bought 30 chocolate bars in total, how would this affect the solution?
5. Can we form a similar equation for a different product mix?

**Tip:** Always check if the total number of items in the problem matches the given constraints to ensure the equation is set up correctly.

Mr. Ng bought 25 mini chocolate bars for his students. Some of them were Mars mini chocolate bars, and some were Reese mini chocolate bars. Mars bars cost $0.30 each, and Reese bars cost $0.45 each. The total cost of the Reese mini chocolate bars was $9.45. If there are x Mars mini chocolate bars, form and solve an equation to find the number of Reese mini chocolate bars.

This problem involves using algebra to solve a linear equation related to the cost of Mars and Reese mini chocolate bars. Given that Mars bars cost $0.30 and Reese bars cost $0.45, the total cost for 25 bars is calculated by forming and solving a linear equation.

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