Give the step-by-step reasoning process and then the final answer. Mary uses plastic grocery bags that can hold a maximum of twenty pounds. She buys 4 pounds of green beans, 6 pounds milk, and twice the amount of carrots as green beans. How many more pounds of groceries can Mary fit in that bag?
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First find the total weight of the carrots: 4 pounds * 2 = 8 pounds. Now add the total weight of each item: 6 pounds + 8 pounds + 4 pounds = 18 pounds. Now subtract the total weight of the groceries from the bag's weight limit: 20 pounds - 18 pounds = 2 pounds.
The final answer: 2.
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