Concept explainers
Problem: A container holds 2 quarts and 4 fluid ounces. The container is now filled with 6 fluid ounces of liquid. How much liquid must be added to the container to make it full? John solved this problem as follows:
So John gave 1 quart and 8 fluid ounces as the answer. Is John right? If not, explain what is wrong with his method, and show how to modify his method of regrouping to make it correct. (Do not start from scratch.)
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