询问这个句子如何理解~~

popris

 A sold different numbers of copies on any two of the day?

是不是任意两天都不一样,那是不是每天都不一样呢?

谢谢~~~

popris

另有一道prep上的题目还是不理解~~~

30  At a certain bakery, each roll costs r cents and each doughnut costs d cents, If A bought rolls and doughnut in the bakery, how many cents did he pay for each roll?

1 A paid 5 dollars for 8 rolls and 6 doughnuts

2 A would have paid 10 dollars if he had bought 16 rolls and 12 doughnuts

 

选E

是否是这样理解：题目求r，条件2的意思是A将付10美圆如果他已经买了16 rolls and 12 doughnuts，是否意味着商店给予了优惠，即不是按照each roll costs r cents and each doughnut costs d cents？如此求不出r？

binggan

写出1和2的方程，两组2元一次方程相同，无法求解。

halcyondays

A sold different numbers of copies on any two of the day?   ==> 是每天都不一样