Jessica had 3 times as many postcards as Antonio. After Jessica gave 30 postcards to her friend and Antonio received 30 postcards from his friend, Antonio had 3/4 as many postcards as Jessica. How many postcards did they have altogether in the beginning?
you do 60 x 4 to find out how many jessica has . Then you divide that answer by 3 to find out how many antonio had. then add the answers. which should be 80 + 240 = 320