英文的数学题the ratio of blue marbles to green marbled in a bag is 2 to 5 .there are 25 green marbles how many marbles in which color would you have to add to make the ratio请回答该问题.并且解释为何要这样算
问题描述：
英文的数学题
the ratio of blue marbles to green marbled in a bag is 2 to 5 .there are 25 green marbles how many marbles in which color would you have to add to make the ratio
请回答该问题.并且解释为何要这样算
答
题目是说 蓝石头：绿石头= 2：5
现在有绿石头 25 块
问袋子里应该有什么颜色的石头多少块满足题目的已知条件
应该有蓝石头 10块
答
已知在任何一个（注意是a）袋子里蓝弹珠和绿弹珠的比率（ratio）是2：5。 现在绿弹珠有25个。 问你要加多少个什么颜色的弹珠 来达成这个比率 25/5=5 5*2=10.
答
原题是：The ratio of blue marbles to green marbles in a bag is 2 to 5.there are 25 green marbles.How many marbles in which color would you have to add to make the ratio 1 to
题意如下：在一个袋子里面,蓝色的弹珠和绿色的弹珠的比例为2：5,绿色的弹珠有25个.问：要增加哪种颜色的弹珠使得袋中两者的比例为1：增加多少?
（-）设增加的是蓝珠.增加前蓝珠的比列占总弹珠的2/7=8/28.增加后若蓝色：绿色为1：3,则蓝色占总弹珠的1/4=7/28