Katy's favorite rides at the amuesment park are the rollercoaster and the water slide. the wait time for the rollercoaster is 25 minutes and the wait time for the water slide is 10 minutes. if she went on 12 rides total and waited three hours in line, how many times did she go on each ride

8 times on the roller coaster and 4 times on the water slide

Step 1 figure out how many total minutes are needed
3*60=180
step 2 start with the water slide and multiply that by 12
10*12=120
step 3 keep replacing 1 water slide with 1 coaster
120+15=135 11 slides 1 coaster
135+15=150 10 slides 2 coaster
150+15=165 9 slides 3 coaster
165 +15=180 8 slides 4 coaster
step 4 double check your work
8*10+4*25=180
step 5 finish