The final percent of juice is 10%
We initially have one quart that is 40% juice and 60% water.
Then initially we have:
Then we add another 3 quarts of water, so the new mixture has:
So we have 4 quarts of mixture.
The new percentage of juice will be:
P = (0.4 quarts/4 quarts)*100% = 10%
The final percent of juice is 10%
If you want to learn more about percentages:
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