prep30，请哪位NN帮忙翻译一下，题没读懂

candicelu

In a certain conference room each row of chairs has the same number of chairs, and the number of rows is 1 less than the number of chairs in a row, How many chairs are in a row?

(1) There is a total of 72 chairs

(2)After 1 chair is removed from the last row, there is a total of 17 chairs in the last 2 rows.

每排有相同数量的椅子，排数比椅子数少1，这是什么意思啊，椅子数相同，却少1，脑袋真的有点短路

sayysong

每排有X把椅子，一共Y排，Y = X - 1
分别都能算出8排，每排9把椅子。
选D吧

sophie177

the number of rows is 1 less than the number of chairs in a row 是说,如果每排有N个椅子,那么一共有 N-1 排.那么椅子的总数就是N(N-1)=72 条件1成立.
条件2:最后一排移走一个后,最后两排还有17张椅子.那么没移走之前就是18张喽,每一排就是有9张喽,条件2也是成立的

这个题选D.