Mr Ong has 40 cars and bicycle altogether.There are a total of 110 wheels.Find the number of cars Mr Ong has.

(1)

      4 * cars + 2 * bicycle = 110 | : 2

      2 * cars +       bicycle = 55

(2)  

            cars +       bicycle = 40

 

(1) - (2)

       2 * cars - cars + bicycle - bicycle = 55 - 40

       cars + 0 = 15

       cars = 15

 

       bicycle = 40 - cars = 40 - 15 = 25

 

cars = 15 and bicycle = 25