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學校購買840本圖書分給高、中、低三個年級段,高年級段分的是低年級段的2倍,中年級段分的是低年級段的3倍少120本。三個年級段各分得多少本圖書?

2019-11-08 20:32:12  來源: 小升初網     閱讀次數:
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學校購買840本圖書分給高、中、低三個年級段,高年級段分的是低.jpg

學校購買840本圖書分給高、中云南十一选五-欢迎您、低三個年級段,高年級段分的是低年級段的2倍,中年級段分的是低年級段的3倍少120本。三個年級段各分得多少本圖書?

解答:

設低年級段分得x本書,則高年級段分得2x本,中年級段分得(3x-120)本

x+2x+3x-120=840

         6x-120=840

                6x=840+120

                 6x=960

                   x=960/6

                   x=160

高年級段為:160*2=320( 本)         

中年級段為:160*3-120=360(本)

答:低年級段分得圖書160本,中年級段分得圖書360本云南十一选五-欢迎您,高年級段分得圖書320本.

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