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

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

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