田丽家现有大米30.5千克,面粉15.5千克,全家每天各吃0.4千克,多少天后剩下大米的重量是面粉的3倍?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 20:16:32
![田丽家现有大米30.5千克,面粉15.5千克,全家每天各吃0.4千克,多少天后剩下大米的重量是面粉的3倍?](/uploads/image/z/1523347-43-7.jpg?t=%E7%94%B0%E4%B8%BD%E5%AE%B6%E7%8E%B0%E6%9C%89%E5%A4%A7%E7%B1%B330.5%E5%8D%83%E5%85%8B%2C%E9%9D%A2%E7%B2%8915.5%E5%8D%83%E5%85%8B%2C%E5%85%A8%E5%AE%B6%E6%AF%8F%E5%A4%A9%E5%90%84%E5%90%830.4%E5%8D%83%E5%85%8B%2C%E5%A4%9A%E5%B0%91%E5%A4%A9%E5%90%8E%E5%89%A9%E4%B8%8B%E5%A4%A7%E7%B1%B3%E7%9A%84%E9%87%8D%E9%87%8F%E6%98%AF%E9%9D%A2%E7%B2%89%E7%9A%843%E5%80%8D%3F)
田丽家现有大米30.5千克,面粉15.5千克,全家每天各吃0.4千克,多少天后剩下大米的重量是面粉的3倍?
田丽家现有大米30.5千克,面粉15.5千克,全家每天各吃0.4千克,多少天后剩下大米的重量是面粉的3倍?
田丽家现有大米30.5千克,面粉15.5千克,全家每天各吃0.4千克,多少天后剩下大米的重量是面粉的3倍?
设x天后剩下大米的重量是面粉的3倍
列方程 30.5-0.4x=3*(15.5-0.4x)
x=20
设X天后剩下大米的重量是面粉的3倍,列方程:
30.5-0.4x=3(15.5-0.4x)
解得:x=20(天)