Tractor wheels
The front wheel of the tractor has a circumference of 18 dm and the rear 60 dm. We will make a red mark on the lowest point of both wheels. The tractor then starts. At what distance from the start will both marks appear identically at the bottom again?
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- algebra
- prime numbers
- divisibility
- least common multiple (LCM)
- planimetrics
- circle
- perimeter
- numbers
- natural numbers
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