Janet needs 5 tickets to ride the roller coaster and 3 tickets to ride the giant slide. How many tickets does she need to ride the roller coaster 7 times and the giant slide 4 times? Think carefully first, then make a decision:
First find how many tickets she needs for the roller coaster: 5 tickets / ride * 7 rides = 35 tickets. Then find how many tickets she needs for the giant slide: 3 tickets / ride * 4 rides = 12 tickets. Then add the number of tickets she needs for each ride to find the total number of tickets she needs: 12 tickets + 35 tickets = 47 tickets. So, the answer is 47.