我唔識點寫方程
以下是問題:
Ken has a total of 36 stamps with face value either $13 or $5 each.
Given that the total value of the stamps is $300,
find the respective number of $13 and $5 stamps.
翻譯:
Ken 一共有36個 stamps , 當中有 $13 and $5的 stamps
總共加起上來有 $300
find $13 and $5 的 stamps 分別有幾多個
急!!!!!!!!!!!!
我聽日要交功課!!!!!!!!!!!!
F.1 Math(急!!! 20點!!!)幫幫忙!!!!!!
2014-01-11 12:52 am
回答 (1)
2014-01-11 12:58 am
✔ 最佳答案
好啦~Let x be the number of $13 stamps.
Then (36 - x) is the number of $5 stamps.
13x + 5(36 - x) = 300
13x + 180 - 5x = 300
8x + 180 = 300
8x = 120
x = 15
36 - x = 21
There are 15 $13 stamps and 21 $5 stamps.
收錄日期: 2021-04-20 14:40:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140110000051KK00120