返回列表 发帖

问两道数学题,归纳规律

1.       If M and N are positive integers that have remainders of 1 and 3, respectively, when divided by 6, which of the following could NOT be a possible value of M+N?

A.      86

B.      52

C.      34

D.     28

E.      10

答案是C 请NN解释一下。而且我对这类余数的题不太熟,有没有什么规律?

2.       A family made a down payment of $75 and borrowed the balance on a set of encyclopedias that cost $400. Then balance with interest was paid in 23 monthly payments of $16 each and a final payment of $9. The amount of interest paid was what percent of the amount borrowed?

A.      12%

B.      6%

C.      14%

D.     16%

E.      20%

答案是D 利息该怎么算?

谢谢大家!

收藏 分享

1.       If M and N are positive integers that have remainders of 1 and 3, respectively, when divided by 6, which of the following could NOT be a possible value of M+N?

A.      86

B.      52

C.      34

D.     28

E.      10

我的想法是:设M=6*m+1, N=6*n+3,则M+N=6*(m+n)+4,那么答案应该选A,因为只有86-4=82不能被6整除

TOP

2.       A family made a down payment of $75 and borrowed the balance on a set of encyclopedias that cost $400. Then balance with interest was paid in 23 monthly payments of $16 each and a final payment of $9. The amount of interest paid was what percent of the amount borrowed?

A.      12%

B.      6%

C.      14%

D.     16%

E.      20%

(1)先计算共付了多少钱:23*16+9=377

(2)计算共借了多少钱:400-75=325

(3)利息=377-325=52

  (4)利息占所借金额的比例=52/325=16%

TOP

Q1.参照楼上mm的解法

Q2.这个题目要先把贷款分离出来,400-75=325

之后一共支付23*16+9=377

(377-325)/325= 0.16

TOP

谢谢!!!!!!

TOP

返回列表

站长推荐 关闭


美国top10 MBA VIP申请服务

自2003年开始提供 MBA 申请服务以来,保持着90% 以上的成功率,其中Top10 MBA服务成功率更是高达95%


查看