求问OG上一道DS题

lamonoui · 发表于 2011-7-4 08:57:09

Beginning in January of last year, Carl made deposits of $120 into his account on the 15th of each month for several consecutive months and then made withdrawals of $50 from the account on the 15th of each of the remaining months of last year. There were no other transactions in the account last year. If the closing balance of Carl's account for May of last year was $2600, what was the range of the monthly closing balances of Carl's account last year?

(1) Last year the closing balance of Carl's account for April was less than $2625
(2) Last Year the closing balance of Carl's account for June was less than $2675

OG上的解释超长又不实用，求哪位XDJM好心解释一下？？

谢谢！！！

viridian · 发表于 2011-7-4 09:10:06

答案是C吗...

lamonoui · 发表于 2011-7-4 23:28:41

对啊，是C. 怎么解的啊~~~~

jessie0209 · 发表于 2011-7-5 00:07:18

前提，5月底的结存为2600，求的是去年每个月的结存钱数范围，就是钱最多的那个月减钱最少的那个月
由（1）推出：5月分是存了120.因为4月钱是少于2625的。易算出1月份有好多钱
由（2）推出：6月份开始取钱了。因为6月份结存少于2675.易算出 12月有多扫钱

1月份的钱减12月份的钱就是 range
SO， C

connie飘着 · 发表于 2011-7-5 08:01:05

我看了半天业没看懂，受教了。

求问OG上一道DS题

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块