This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
30 cm
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Step 1: Identify the given scale and prototype measurement. The scale is . This means that for every 1 unit on the prototype, there are 5 units on the actual gear. The prototype diameter is .
Step 2: Set up the ratio to find the actual diameter. Let be the prototype diameter and be the actual diameter. The scale can be written as a ratio:
Step 3: Substitute the given prototype diameter and solve for the actual diameter. To find , multiply both sides by :
The machinists must produce a diameter of 30 cm.
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Alright — let's do this. Step 1: Identify the given scale and prototype measurement.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.