The ratio of cars to trucks in the student parking lot is 4:3. If there are a total of 210 vehicles in the parking lot, how many cars are in the lot?

Answer 1

c/t=4/3

c/(210-c)=4/3

cross multiply

3c = 840-4c

7c = 840

c = 120 cars

t = 210-120 = 90 trucks

or

c/t = 4/3

3c = 4t

3c -4t= 0

c+t = 210

4c +4t =840

add

7c = 840

c = 120 cars

t = 210-120= 90 trucks