数学题:一种农药用药液和水按照1:1500配制而成

  • 时间:2020-06-09 15:27:22
  • 分类:数学世界
  • 阅读:152 次

数学题:一种农药用药液和水按照1:1500配制而成。

(1)要配制这种农药60.04千克,需要药液和水各多少千克?

(2)现在只备有30千克水,要配制这种农药需要多少千克药液?

(3)如果有3千克药液,能配制这种农药多少千克?(提问:“月光-资优网”)

数学题解答(烟雨-资优网):

第一个问:
(1)要配置这种农药750.5千克,需要药液与水各多少千克?

设需要药液x千克,则水为750.5-x千克

x:(750.5-x)=1:1500

1500x=750.5-x

x=0.5千克

750.5-0.5=750千克

第二个问:
(2)现在只备有540千克的水,要配置这种农药,需要多少千克?

设需要药液x千克,则

x:540=1:1500

1500x=540

x=0.36千克

第三个问:
(3)如果现在只有3千克的药液,能配制这种农药多少千克?

设能配制这种农药x千克,则需水x-3千克

3:(x-3)=1:1500

x-3=4500

x=4503

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