How to do this?
2016-12-27 12:09 pm
In a Christmas ball, the ratio of the number of boys to the number of girls is 5:7. If the 37 boys and 60 girls leave the Christmas ball, then the number of boys is three-fourth that of girls. Find the original number of girls in the Christmas ball.
回答 (3)
2016-12-29 1:39 pm
How to do this?
In a Christmas ball, the ratio of the number of boys to the number of girls is 5:7. If the 37 boys and 60 girls leave the Christmas ball, then the number of boys is three-fourth that of girls. Find the original number of girls in the Christmas ball.How to do this?
In a Christmas ball, the ratio of the number of boys to the number of girls is 5:7. If the 37 boys and 60 girls leave the Christmas ball, then the number of boys is three-fourth that of girls. Find the original number of girls in the Christmas ball.
In a Christmas ball, the ratio of the number of boys to the number of girls is 5:7. If the 37 boys and 60 girls leave the Christmas ball, then the number of boys is three-fourth that of girls. Find the original number of girls in the Christmas ball.How to do this?
In a Christmas ball, the ratio of the number of boys to the number of girls is 5:7. If the 37 boys and 60 girls leave the Christmas ball, then the number of boys is three-fourth that of girls. Find the original number of girls in the Christmas ball.
2017-01-09 6:17 pm
224
2016-12-27 7:01 pm
Sol
5+7=12
設男孩有5x人
女孩有7x人
(5x－37)：(7x－60)=3：4
4(5x－37)=3(7x－60)
20x－148=21x－180
x=32
7x=224
the original number of girls in the Christmas ball is 224
5+7=12
設男孩有5x人
女孩有7x人
(5x－37)：(7x－60)=3：4
4(5x－37)=3(7x－60)
20x－148=21x－180
x=32
7x=224
the original number of girls in the Christmas ball is 224
收錄日期: 2021-04-18 15:58:36
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