果园里有桔子树和梨树共360棵
- 时间:2020-05-20 15:29:31
- 分类:数学世界
- 阅读:140 次
数学题:果园里有桔子树和梨树共360棵,其中桔子树占总数的百分之二十,今年又种了一些桔子树,这时桔子树和梨树的比是2:3,今年种桔子树多少棵?
数学题解答:原来的桔子树占总数的20%,可以先算出原来桔子树有多少棵?
360 × 20% = 72(棵)
那么梨树就有:
360 - 72 = 288(棵)
又种了一些桔子树后,桔子树占梨树的2/3,算出此时的桔子树棵数:
288 × 2/3 = 192(棵)
后来种的桔子树棵数:
192 - 72 = 120(棵)。
答:今年种桔子树120棵。
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