mandy can type 100 words in 144 seconds correct to the nearest second. if she types at the same rate,determine whether she can type 1200 words in half an hour. explain your answer.
explain your answer.
explain your answer.
easy math (1 question)
2013-08-27 7:07 am
回答 (3)
2013-08-27 7:39 am
✔ 最佳答案
Typing rate = 25/36 words per second (words/s)The number of words she can type in half an hour= 25/36 x (60x30) =1250words
Since 1250 > 1200
Therefore, the answer is correct.
2013-08-26 23:43:17 補充：
60 represents 60 seconds
In half an hour (30 minutes), there are (60x30) seconds
2013-08-27 00:36:15 補充：
Masterijk,
對:D
2013-08-27 9:04 am
100 words = 144 seconds
1200 words = 100 words x 12 = 144 seconds x 12 = 1728 seconds = 28.8 mins
Mandy can type 1200 words in half an hour at the same rate.
Formula as below :
144 seconds/100 x 1200 = 1728 seconds = 28.8 mins.
1200 words = 100 words x 12 = 144 seconds x 12 = 1728 seconds = 28.8 mins
Mandy can type 1200 words in half an hour at the same rate.
Formula as below :
144 seconds/100 x 1200 = 1728 seconds = 28.8 mins.
參考: Maths
2013-08-27 7:43 am
cf, 題目的意思有可能想問關於 rounding, approximation, estimation的知識。
144 seconds correct to the nearest second, 即是可以在 143.5 seconds 和 144.5 之間。
那麼打1200字就需時 143.5*12 至 144.5*12 seconds之間,
即 1722 秒 和 1734 秒之間
即 28.7 分鐘 和 28.9 分鐘之間
所以必定在 30分鐘之內
144 seconds correct to the nearest second, 即是可以在 143.5 seconds 和 144.5 之間。
那麼打1200字就需時 143.5*12 至 144.5*12 seconds之間,
即 1722 秒 和 1734 秒之間
即 28.7 分鐘 和 28.9 分鐘之間
所以必定在 30分鐘之內
收錄日期: 2021-04-13 19:41:09
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