Answer: 30 cards
Explanation:
To find the greatest possible number of cards in each pile such that there is the same number of cards in each pile we need to find the greatest common factor of 750 and 660.
Using Euclid division method , we have
![750=1(660)+90\\\\660=7(90)+30\\\\90=3(30)+0](https://img.qammunity.org/2020/formulas/mathematics/college/ermvjwd5cf08qf28a1ktlvn3iaq9guc5gu.png)
Hence, the greatest common factor of 750 and 660 = 30
Thus, there will be 30 cards in each pile.