方程式一問 8(詳列步驟)

2009-08-27 4:21 am
Peter has 2x five dollar coins and x two dollar coins.
By adding one condition,find a possible value of x.
A. If the total amount of money is $________,then x=__________
B. If the number of coins is__________,then x=_________

回答 (1)

2009-08-27 2:33 pm
✔ 最佳答案
其實答案有很多,
我就舉一個例子吧!


A. If the total amount of money is $24,then x=2
(2*5x)+2x= 24
12x= 24
x= 2

B. If the number of coins is 15,then x=5
2x+x=15
3x=15
x=5

另外還無數答案,
總之,Total amount of money 一定是12倍數,
如:24、120、252、1200、3600、72000... ...
另外,Number of coins 就一定是3倍數。







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