1. **Problem:** Betsy has 14.25 and her brother has 16.00. They want to buy two water guns costing 12.99 each and a bag of water balloons costing 4.79. Do they have enough money? If so, how much is left? If not, how much more is needed? 2. **Formula and rules:** Total cost = (cost of water gun \times 2) + cost of water balloons. 3. **Calculate total money they have:** $$14.25 + 16.00 = 30.25$$ 4. **Calculate total cost:** $$12.99 \times 2 = 25.98$$ $$25.98 + 4.79 = 30.77$$ 5. **Compare money and cost:** They have 30.25 but need 30.77. 6. **Calculate how much more money is needed:** $$30.77 - 30.25 = 0.52$$ **Answer:** They do not have enough money; they need 0.52 more. --- 1. **Problem:** If Betsy earns another 6, will they have enough money to buy two water guns and two bags of water balloons? 2. **Calculate new total money:** $$30.25 + 6 = 36.25$$ 3. **Calculate new total cost:** $$12.99 \times 2 = 25.98$$ $$4.79 \times 2 = 9.58$$ $$25.98 + 9.58 = 35.56$$ 4. **Compare money and cost:** They have 36.25 and need 35.56. 5. **Calculate leftover money:** $$36.25 - 35.56 = 0.69$$ **Answer:** Yes, they have enough money and will have 0.69 left over.