Tractor wheels

Smaller tractor wheel has a circumference of 3 meters, bigger 4 meters. On what path executes smaller wheel 6 turns over bigger?

Correct answer:

x =  72 m

Step-by-step explanation:

3(r+6)=4r
x = 4r

3•(r+6)=4•r
x = 4•r

r = 18
4r-x = 0

r = 18
x = 72

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