[求助]如何解答这几道数学题？请高手帮忙。

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 21^st day of the billing cycle.

(2) The average
daily balance through the 25^th day of the billing cycle was $ 540.

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?

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?

3. Does the integer k have a factor p such
that 1<p<k?

(1)k >4!

(2)13! + 2<= K <=
13! +13

第四题没太理解，请哪位NN回答一下，谢谢！