First, you have to set up a system of equations. You can see all of my work and explanation on the picture attached! The answer is 40 adult tickets. I hope this helped you!! :))
Triangle=10
Circle=5
Square:3.5
Half square:1.75
Answer to ?:26.25
0.75m + 5 = 0.5m + 9
0.75m - 0.5m = 9 - 5
0.25m = 4
m = 4 / 0.25
m = 16 <=== at 16 miles, the companies will charge the same amount
The answer is 7. Subtract 1600-1450= 150. Then do 150/19 =7 (rounded down).