Respuesta :
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
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