Sally and Marta have the same number of postcards

To compare the number of postcards Sally and Marta have, we would need actual numbers or information about their postcard collections. Without this information, it is not possible to determine if they have the same number of postcards.

If you have the number of postcards for both Sally and Marta, you can simply compare the numbers to see if they are equal. For example, if Sally has 10 postcards and Marta also has 10 postcards, then they have the same number of postcards.

If you don't have the actual numbers, you can ask Sally and Marta individually about their postcard collections and compare their answers to determine if they have the same number.