Let's solve the problem based on the image.

We are given:

• The cost of 6 pencil sharpeners is £2.88.
• The cost of 8 colouring crayons is £4.56.

Part (a): Difference in cost between 1 pencil sharpener and 1 colouring crayon.

1. Cost per pencil sharpener: $\text{Cost per sharpener} = \frac{£2.88}{6} = £0.48$

2. Cost per colouring crayon: $\text{Cost per crayon} = \frac{£4.56}{8} = £0.57$

3. Difference in cost: $\text{Difference} = £0.57 - £0.48 = £0.09$

So, the difference in cost between 1 pencil sharpener and 1 colouring crayon is £0.09.

Part (b): Total cost for 3 boxes of each item.

1. Cost for 3 boxes of pencil sharpeners: $3 \times £2.88 = £8.64$

2. Cost for 3 boxes of colouring crayons: $3 \times £4.56 = £13.68$

3. Total cost: $£8.64 + £13.68 = £22.32$

So, the total cost for 3 boxes of each item is £22.32.

Would you like further clarification or more details on any step?

Here are 5 questions you can try to expand on these ideas:

1. If the price of a sharpener increased by 10%, what would be the new cost for 1 sharpener?
2. If you bought 5 boxes of colouring crayons, how much would it cost?
3. How much would it cost if you bought 2 sharpeners and 4 crayons?
4. What percentage of the total cost for 3 boxes is spent on sharpeners?
5. If you had a £25 budget, how many boxes of each could you buy?

Tip: Always check if the price per item can be simplified to make calculations faster.