Math
posted by Kim .
A parking lot contains a total of 52 cars and motorcycles. There are a total of 186 tires (not counting spare tires) in the lot. Assuming each car has 4 tires and each motorcycle has 2 tires, determine how many cars and how many motorcycles are in the parking lot.

cars  x
bikes y
x+y = 52
4x + 2y = 186 or
2x + y = 93
subract:
x = 41
then 41 + y = 52 > y = 11
There are 41 cars and 11 bikes.