Jonathan collects postcards and stamps. the number of postcards in his collection is 12 more than 3/4 the number of stamps. he has 39 postcards in all. if jonathan has x stamps, which equation represents this situation and how many stamps does he have?

Breana is selling tickets to a choral performance. on the first day of ticket sales , she sold 3 senior citizen tickets and 1 child ticket for a total of $38. breana took in $52 on the second day by selling 3 senior citizen tickets and 2 child tickets. what is the price of a senior citizen ticket?