1。Al, Lew and Karen pooled their funds to buy a gift for a friend. Al contributed 2 dollars less than 1/3 of the cost of the gift and Lew contributed 2 dollars more than 1/4 of the cost. If Karen contributed the remaining 15 dollars, what was the cost of gift.
2。what is total number of integers between 100 and 200 that are divisible by 3?/ 有公式吗?