how many teeth does each gear have

Question

Two gears have a total of 80 teeth, and one gear has 48 fewer teeth than the other. How many teeth does each gear have?

Answer 1

x and x-48

x+x-48=80

2x-48=80

2x=80+48

2x=128

x=128/2

x=64

64-48=16

64 and 16

 

80/2=40

40 and 40

50 and 30

60 and 20

61 and 19

62 and 18

63 and 17

64 and 16