there are 20 cars and motorcycles in a parking area. If there are 56 wheels alltogether, how many cars are there?
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Solution
Let the number of wheels of car be x and number of wheels of motocycle be y.
So,
x y = 56 ...............(1)
x/4 y/2 = 20
x 2y = 80 ...............(2)
Subtract equation 1 from 2
y = 24
x = 32
So number of cars = 32/4 = 8