1. **State the problem:** We need to find the total weight of a carton containing 24 tins of powdered milk, where each tin weighs 400 grams and the carton itself weighs 150 grams. 2. **Formula used:** Total weight = (Number of tins \times Weight per tin) + Weight of carton 3. **Calculate the total weight of the tins:** $$24 \times 400 = 9600 \text{ grams}$$ 4. **Add the weight of the carton:** $$9600 + 150 = 9750 \text{ grams}$$ 5. **Final answer:** The total weight of the carton with 24 tins is **9750 grams**.