1. **State the problem:** Arron shared 18 strawberries equally with his 2 sisters. We need to find how many strawberries each sister received. 2. **Formula used:** When a quantity is shared equally among a number of people, each person receives $ \frac{\text{total quantity}}{\text{number of people}} $. 3. **Apply the formula:** Here, total strawberries = 18, number of sisters = 2. 4. **Calculate:** $$\frac{18}{2} = 9$$ 5. **Interpretation:** Each sister received 9 strawberries. **Final answer:** Each sister received 9 strawberries.