烧结页岩多孔砖规格:do you know how to do this?

来源：百度文库编辑：神马品牌网时间：2024/04/29 19:56:16

a purse contain a collection of quarters,dimes,nickel, and pennies. The average value of the coins in the pure is 17 cents. If a penny is removed from the purse, the average value of the coins becomes 18 cents. How many nickels are in the purse?

can you help me to do this question? about math

设:钱包里有X个硬币(SUPPOSE:there are X coins in the purse)
(17x-1)/(x-1)=18
x=17
17*17=289 4 pennies
289-4=285 17-4=13
25*11+10*0+5*2=285
11+0+2=13
there are 2 nickles in the purse

sorry,I don't know

就一个吧？你原文里nickel用的是单数嘛。

一个钱包包含一次四分之一的收集，一角钱，镍和便士。平均硬币在纯净内的价值是17分。一便士从钱包那里除去如果，平均硬币的价值成为18分。多少五分镍币在这个钱包里？

共有17个硬币，具体有几个5分硬币好像不能确定吧25a+10b+5c+d=17(a+b+c+d) ,25a+10b+5c+d-1=18(a+b+c+d-1)
或者是一个，因为你用的是单数

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