22.On Janes credit card account, the average daily balance for a 30-day billing cycle is the average of the daily balances at the end of each of the 30 days.At the beginning of a certain 30-day billing cycle,Janes credit card account had a balance of $600.Jane made a payment of $300 on the account during the billing cycle.If no other amounts were added to or subtracted from the account during the billing cycle, what was the average daily balance on Janes account for the billing cycle?
1) Janes payment was credited on the 21st day of the billing cycle.
2) The average daily balance through the 25th day of the billing cycle was $540.
The key is D,but why?
考阅读的题,我读的很累,能不能翻译成中文:,每个格子里有一个数字,求所有数字的平均数 1 已知各横向平均数的总和 2 已知各纵向平均数的总和令格子总数为 mn 其中m为行数, n为列数
已知各横向的平均数总和,表示.所有数字和为 n 则平均数为
n/=/m ,而m的值待定,所以平均数求不出. 而总和 是可以把结果求出来的,结果与m,n无关
24. 有图说是一个转盘,分为8个区域,分别代表1到8,箭头转到哪个区域,那个人就走多少步,
问一共3次转要走16步的话,有多少种不同的排列顺序。
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