Brian bought 8 postcards during 4 days of vacation. How many days will Brian have to spend on vacation before he will have bought a total of 18 postcards? Assume the relationship is directly proportional.
it would be 36 postcards since you can mupity 18 by 4 you have to divide the proportional that be by 4 and 2 and you can do it by 9 so the to the other number and you will get 36
