6th Grade Concentration Problems: Problem 2

Problem: In two cups there are 40% and 10% salt water. After combining, the percentage of the water that is salt water is 30%. After adding 300 grams of 20% concentrated salt water, the total concentration of the combination became 25%. Q: How many grams of salt water was the original 40% concentrated cup?

Key: Think of the sugar as 100% concentrated

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