Last ! . visitors to a carnival can buy an unlimited-ride pass for $50 or an entrance-only pass for $20. in one day, 282 passes were sold for a total of $10,680. how many unlimited-ride passes were sold?

now x+y=282

hence y=282-x

now see the amount collect is $10680

that is =>50x+20y=10680

try to think a lil' here now substitute that equation which i gave you in the previous comment and viola ... you get x to be 168

c. 1,233 miles

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)