请大牛们指点迷津！
我在OG11中遇到了这几道题，不知道如何解答。 1.A rainstorm increased the mount of water stored J reservoirs from 124 billion gallons to 138 billion gallons. If the storm increased the mount of water in the reservoirs to 82 percent of total capacity, approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm? A 9 B14 C25 D 30 E 44 2． Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the X-axis. The x- and y-coordinates of P,Q, and R are to be integers that satisfy the inequalities -4<=x<=5 and 6<=y<=16.How many different triangles with these properties could be constructed? A 110 B 1100 C 9900 D 1000 E 12100 下面是两道date sufficiency 类型题： 3. Does the integer k have a factor p such that 1<p<k? (1)k >4! (2)13! + 2<= K <= 13! +13 4. On Jane’s credit card account, the average daily balance for a 30-day billing cycle is the average(arithmetic mean) of the daily balances at the end of the 30 days. At the beginning of a certain 30-day billing cycle, Jane’s 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 Jane’s account for the billing cycle? (1)Jane’s 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. | 
