幫幫手( maths )

2006-10-23 8:08 am

小明see 1 400頁的book , 估計10天see完 .但實際everyday see book的效率提高左25%,問小明實際需要多少天see完book ?
列(識)唔該

回答 (4)

2006-10-23 8:17 am

✔ 最佳答案

估計的看書速度 = 1400/10 = 140頁/天

實際的看書速度 = 140 x (1+25%) = 175頁/天

小明實際需要的看書日數 = 1400/175 = 8天

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2006-10-23 8:17 pm

1400/[(1400/10)x(1+25%)]
=1400/175
=8
andy

參考: me

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2006-10-23 8:15 am

1400/[(1400/10)x(1+25%)]
=1400/175
=8
小明實際需要8天

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2006-10-23 8:12 am

1400/10 that mean each day read 140 pages
140*1.25 =175 that mean after he reads 175 pages per day
1400/175=8 , so 8 days will finish his books.

參考: My knowledge

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