1. **State the problem:** Four friends bought 4 large iced coffees for 18. We need to find the cost of each coffee, how many coffees can be bought with 35, and the cost of 9 coffees. 2. **Formula and rules:** - Cost per coffee = Total cost ÷ Number of coffees - Number of coffees with given money = Total money ÷ Cost per coffee - Total cost for given coffees = Number of coffees × Cost per coffee 3. **Calculate cost per coffee:** $$\text{Cost per coffee} = \frac{18}{4} = 4.5$$ 4. **Calculate how many coffees can be bought with 35:** $$\text{Number of coffees} = \frac{35}{4.5} \approx 7.78$$ Since they can't buy a fraction of a coffee, they can buy up to 7 coffees. 5. **Calculate cost for 9 coffees:** $$\text{Cost for 9 coffees} = 9 \times 4.5 = 40.5$$ **Final answers:** - Cost of each coffee is 4.5. - With 35 to spend, they can purchase up to 7 iced coffees. - 9 iced coffees would cost 40.5.