簡單數學一題－bxzbthf的部落格

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簡單數學一題

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發問:

DON has some pocket money left last week .Her father gives her $250 more this week.She donates one-third of her money to the Chest.Her sister also donates $100 to the Chest.If they together donate $420 to the Chest,how much pocket money does Don receive from last week?

最佳解答:

Let m be the amount of pocket mony left last week. The total amount of pocket money Don has this week = m + 250. Then, (m+250)/3 + 100 = 420 => (m + 250)/3 = 320 => m + 250 = 320 x 3 = 960 => m = 960 - 250 = 710. Therefore, Don received $710 pocket money last week.

其他解答:

Let X be the pocket money Don receive from last week (X + $250) x 1/3 + 100 = $ 420 (X + $250) x 1/3 = $ 420 - 100 (X + $250) = $ 320 x 3 X = $960 - $250 X = $710 Don receive $710 pocket money from last week|||||答案係580 包無錯如果你唔信可以睇下老師批完之後點8758B59A7FA1EEA7