数学问题，大家讨论•••

静雯 · 发表于 8-4-2011 11:13:45|来自：新加坡

本帖最后由静雯于 6-12-2012 11:07 编辑

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doueyuan · 发表于 8-4-2011 18:21:19|来自：新加坡

:victory:

飞跃漂流 · 发表于 8-4-2011 20:10:23|来自：新加坡

太好了！

欢迎好运 · 发表于 8-4-2011 22:55:34|来自：新加坡

谢谢先!

欢迎好运 · 发表于 10-4-2011 23:57:29|来自：新加坡

The ratio of the number of girls to the number of boys in the swimming club was 4:5 ,After a group of boys entered the swimming club .40%of the new total number of children were girls.What was the percentage increase in the number of boys?

请帮忙解题!谢谢先!
最好能写上步骤.

静雯 · 发表于 11-4-2011 14:36:24|来自：新加坡

Solution

Before changing, girls : boys = 4:5
After changing, girls : boys = 40% : 60% = 4: 6
(The number of girls remains unchanged.)

The number of boys was increased from 5 units to 6 units.

Increase = 1 unit

Percentage increase in the number of boys = Increased / Original = 1 unit/ 5 units = 1/5 =20%

飞跃漂流 · 发表于 11-4-2011 15:18:03|来自：新加坡

the percentage increase 指的是占总数的百分比吗？

飞跃漂流 · 发表于 11-4-2011 15:20:34|来自：新加坡

我不懂这里说的是不是占总数的百分比增加了多少。

静雯 · 发表于 11-4-2011 15:36:08|来自：新加坡

What was the percentage increase in the number of boys?

To calculate a percentage increase, we have to know the increase in value of a quantity from its original value.

The formula is : Percentage Increase = Increase / Original value *100%.

Here: according to the question of the problem, the original value means the original number of the boys.

欢迎好运 · 发表于 11-4-2011 22:24:44|来自：新加坡

非常感谢!

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