Question

SAT数学题~~这题好难!!

A measuring cup contains 1/5 of a cup of orange juice. It is then filled to the 1 cup mark with a mixture that contains equal amounts of orange, grapefruit, and pineapple juices. What fraction of the final mixture is orange juice. 求翻译和详细解答过程~~~这题答案是7/15~

Answer 1

有一个杯子装了1/5的橘汁 ，用一满杯装了橘汁 柚汁 和菠萝汁的来填满它 且这三种饮料的分量相同 则最后橘汁的成分是多少?
首先原有橘汁1/5 添加的是一满杯 但只能装4/5 则 添加成分为4/5*1/3=4/15 则最后橘汁成分=4/15+1/5=7/15