Joyce and tina had an equal amount of money. each day, joyce spent $24 and tina spent $28. when tina spent all her money, joyce still had $64 left. in how many days did tina spent all her money?

Joyce and Tina had an equal amount of money

Lets x = # of days they spent money

Joyce spent $24 still had $64 left = 24x + 64

Tina spent $28 a day and spent all her money, no left = 28x

Both has equal amount of money so

28x = 24x + 64

Subtract 24x from both sides

4x = 64

Divide both sides by 4

x = 16

Tina spent all her money in 16 days.

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