What we know: 35 minutes per rollercoaster, 25 minutes per show, 3 more coaster
1 show
1 show (25 minutes) (+3 more rollercoasters than shows), 4 coasters (35x4) 140 minutes = 165 minutes total. ..... too small
2 shows (50 minutes) (+3 more rollercoasters than shows), 5 coasters (35x5) (175 minutes) = 225 minutes total ....... too small
3 shows (75 minutes) (+ 3 more rollercoasters than shows), 6 coasters (35x6) (210) = 285 minutes total ....... too small
4 shows (100 minutes) (+3 more rollercoasters than shows), 7 coasters (35X7) (245) = 345 minutes total ........ answer.
Answer: 7 rollarcoasters, 3 shows, 345 minutes total
