Bill buys a red marble and a blue marble. if the total weight of 3 such marbles and 5 such marbles is 84, and the total weight of 12 such red marbles and 5 such blue marbles is 282, what is the weight of the red marble and the blue marble respectively?

i used to know but i learned it a long time ago sorry

step-by-step explanation:

i dont know if you cant find a way its best to actually add all of them start from 105 tho

step-by-step explanation:

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads