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數學題唔識??

發問:

The volume of water in a pool was increased by 20% in July, then decreased by 5% in August and increased by 25% September. What was the overall percentage change in the volume of water between the beginning of July and yhe end of September? 更新: 答案係42.5%

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最佳解答:

The volume of water in a pool was increased by 20% in July, then decreased by 5% in August and increased by 25% September. What was the overall percentage change in the volume of water between the beginning of July and the end of September? let x be the beginning of July overall percentage change= [{[x(1+20%)(1-5%)(1+15%)]-x}/x]*100% =[(1.425x-x)/x]*100% =0.425*100% =42.5% 請發問者不要移除問題 另請其他人不要抄襲或略作修改我的答案 2008-09-15 15:50:29 補充： 悠閒舒適? 兄係唔係睇錯左between Aug and Sept?? 真係唔小心><" 2008-09-25 21:14:13 補充： 發問者： chun_1209 ( 小學級 5 級) 2008-09-15 15:40:15 補充 答案係42.5% 為什麼001的錯誤答案仲有人選擇?

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