The whiteboards she bought cost $35, and she spent a total of $51.20, subtract to find out the total amount she spent on posters:
So she spent a total of $16.20 on posters, now divide by the amount one poster costs to find out how many posters she bought.
So she bought 3 posters.
So she spent a total of $16.20 on posters, now divide by the amount one poster costs to find out how many posters she bought.
So she bought 3 posters.