If some additional resistance is added to the voltmeter

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Description

If some additional resistance is added to the voltmeter, the measurement limit of the device increases by 2 times, adding another resistance increases the measurement limit by 5 times. How many times will the measurement limit increase if we connect both resistors in parallel and then connect them to the voltmeter in series?

Additional information

Task 31666. Detailed solution with a brief record of the conditions, formulas and laws used in the decision, the conclusion of the calculation formula and the answer.
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