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