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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

    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?
    數(shù)學(xué)人氣:566 ℃時(shí)間:2020-01-31 21:00:48
    優(yōu)質(zhì)解答
    在一個(gè)班級(jí)里,三分之一是男生,剩下的都是女生.3個(gè)男生和3個(gè)女生離開班級(jí)以后,現(xiàn)在男生人數(shù)是女生的五分之二.最后班里還有多少小學(xué)生?
    21人.
    設(shè)原來(lái)男生有x人,則原來(lái)女生有2x人.
    x-3/2x-3=2/5
    解得x=9
    則現(xiàn)在班里有9×3-6=21(人).
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