Question

一道英文数学题,要过程，谢谢

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?

Answer 1

The mixture is 1 - 1/5 = 4/5 of the cup, containing equal amounts of orange, grapefruit, and pineapple juices, so in this part, each juice is (4/5)*(1/3) = 4/15 of the cup; orange juice is 4/15 + 1/5 = 7/15 of the cup, therefore:

Orange juice: 7/15
Grapefruit juice: 4/15
pineapple juice: 4/15

Answer 2

它的意思是有一个测量杯，里面已经有1/5杯的橙汁，然后又倒进另一个有刻度的杯子，里面已有等量的3样果汁【其中有一种是橙汁】。问：最后有多少量的橙汁在混合物中？【分数表示】
1/5+1/3*4/5=7/15

Answer 3

1-1/5=4/5
4/5÷3=4/15
4/15 + 1/5 =7/15