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单选题
A container holds 8 pints of a solution which is 25% acid. If 2 quarts of pure acid are added to the container, what percent of the resulting mixture is acid? (1 quart=2 pints)
A
50
B
20
C
40
D
45
E
35
参考答案
参考解析
解析：
Remember that 2 quarts of acid are 4 pints. There are now 8×25%+4, or 6 pints of acid in 12 pints of solution. Therefore the new solution is 4/10 or 50%acid.
Remember that 2 quarts of acid are 4 pints. There are now 8×25%+4, or 6 pints of acid in 12 pints of solution. Therefore the new solution is 4/10 or 50%acid.
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