Respuesta :

Answer: 4 postcards


Step-by-step explanation: 20/5=4



[tex]5x = 20[/tex]
5 times the number (x) is 20. To solve for x you must get rid of the 5, and the opposite of multiplication is divison.
[tex]5x = 20 \\ x = 4[/tex]
so 4 postcards :)