In an enrichment class,1/3 are boys and the restare girls.After 3 girls and 3 boys leave the class,there are now 2/5 as many boys as girls.How many pupils are there in the class in the end?

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In an enrichment class,1/3 are boys and the restare girls.After 3 girls and 3 boys leave the class,there are now 2/5 as many boys as girls.How many pupils are there in the class in the end?
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In an enrichment class,1/3 are boys and the restare girls.After 3 girls and 3 boys leave the class,there are now 2/5 as many boys as girls.How many pupils are there in the class in the end?
In an enrichment class,1/3 are boys and the restare girls.After 3 girls and 3 boys leave the class,there are now 2/5 as many boys as girls.How many pupils are there in the class in the end?

In an enrichment class,1/3 are boys and the restare girls.After 3 girls and 3 boys leave the class,there are now 2/5 as many boys as girls.How many pupils are there in the class in the end?
在一个班级里,三分之一是男生,剩下的都是女生.3个男生和3个女生离开班级以后,现在男生人数是女生的五分之二.最后班里还有多少小学生?
21人.
设原来男生有x人,则原来女生有2x人.
x-3/2x-3=2/5
解得x=9
则现在班里有9×3-6=21(人).

我们假设男生为x,女生为y,开始时候的学生总数为z.
则有x+y=z, x-3=2/5(y-3) 由于x=1/3z,y=2/3z
可求出z=27,x=9,y=18.
最后人数=(9-3)+(18-3)=21

30
1/3a-3=2/5(2/3a-3)
a=36
a-6=30

In my point that,I think it is useful that we attend an enrichment class.Maybe we will less freedom,but we did improve our studies,we have more and more tests in the future,it is important that have an enrichment class.Once I attended an enrichment c CLA是什么 CLA是什么意思 ClA是什么 In an enrichment class,1/3 are boys and the restare girls.After 3 girls and 3 boys leave the class,there are now 2/5 as many boys as girls.How many pupils are there in the class in the end? self enrichment什么意思 Enrichment Talks是什么意思?谢谢 英语翻译He has stopped in during enrichment once so far but has indicated he will be appearing regularly. 英语翻译Enrichment in tritiated water depends on the isotopic separation factor,thereby the current and the permeability values. 英语翻译Imagine you work for a motoring organisation.You have read an overseas report that says that the brand of tyres used on a car makes little difference to its stopping distance when braking in an emergency.You decide to investigate this cla Rudy does better in English than any other student in her class 同义句 Rudy()()inEnglish in her cla This is an orange(变成复数形式)还有:Are those boxes?(肯定和否定回答)He hes big hands.(改成一般疑问句)She is in class Two,Gracle seven.(从class到seven这部分来提问)She is in class Two,Gracle seven.(从cla CLA表示什么意思 CLA有什么功效 CLA是什么意思 谢谢 CLA这首歌什么意思 “This is ______ most useful reference book,” a teacher from ______ European country told us in cla a the professors tend to expect a higher level of analysis in master's classes than undergraduate cla