Solving a problem in physics section 67 point 38 electr

Solving a problem in physics section 67 point 38 electr

38. In a circuit consisting of a battery and a resistor with a resistance of 10 Ohms, a voltmeter is first connected in series and then parallel to a resistor with resistance R. Both voltmeter readings are the same. The resistance of the voltmeter is 1000 Ohms. What is the internal resistance of the battery?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)