cart of watermelons weighs 2005 kilograms. Assuming that the weight of each watermelon is equal, and the number of kilograms of each watermelon is a natural number greater than 1, after selling some watermelons, there are 1520 kilograms left. What is the weight of each watermelon?
一车西瓜共重2005千克，假设每个西瓜的质量相等，且每个西瓜的千克数都是大于1的自然数，卖掉一些西瓜后还剩1520千克，每个西瓜重多少千克．
<result>5</result>