DS：During a 10 week summer vocation, was the average number of books that C read per week greater than the average number of books that J read per week ?

(1)Twice the average number of books that C read per week was greater than 5 less than twice the average number of books that J read per week

(2) During the last 5 weeks of summer vocation, C read a total 3 books more than J

能帮我解释一下条件1的意思吗 ？什么 叫greater than 5 less than ？

这个greater than 5 less than是表示不等式的， 假设C平均每星期读x本书，J平均每星期读y本书，条件1表示的条件就是2y> 2x>5. 同意楼上的答案为A。

因为条件2，光从过去5个星期的情况无法得知，10个星期的平均数。

不知道说的是否清楚。