Scale of voltmeter

Which scale division (scale has 100 divisions) must the voltmeter hand point at a measuring range of 300V if we want to measure a voltage of 100V?

Correct answer:

n =  33

Step-by-step explanation:

$$\begin{gathered} U_1=100\text{V} \\ {U}_2=300\text{V} \\ n=\frac{U_1}{U_2}\cdot 100=\frac{100}{300}\cdot 100=\frac{100\cdot 100}{300}=\frac{10000}{300}=\frac{100}{3}=33\frac{1}{3}=33 \end{gathered}$$

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