Q.1
Dick has 22 coins. Each coin is either a $2 coin or a $5 coin.The total value of the coins is more than $83.Find the maximum number of $2 coins that Dick has. (Ans:8)
Please give me steps and explaination!
Maths question (HW)
2007-11-17 2:31 am
回答 (1)
2007-11-17 6:30 am
✔ 最佳答案
let there are x $2 coin and y $5 coin.`. x+y=22
2x+ 5y >83
2x+5x-5x+5y>83
2x-5x+5(x+y)>83
-3x+5(22)>83
-3x+110>83
27>3x
x<9
.`.the maximum number of $2 coins is ８
參考: myself
收錄日期: 2021-04-13 14:30:34
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