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一道老题
A mixture is composed of 5 gallons of water and 5 gallons of antifreezer. Now use 3 gallons of the mixture and add 3 gallons of antifreezer to the mixture. What is the percentage of antifreezer in the mixture now?
[确认] 65%
我认为是75%.
(50%*3+3)/(3+3)=75%
不知我错在哪里?请求指点! |
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