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| style="height:20px; width: 300px; text-align:left;" |'''3. [[Rearrange (Maths)|Rearrange]] the equation and [[Solve (Maths)|solve]].'''
<math>3 = 0.5 \times V_s = 3</math>
<math>V_s = 6V</math>
| style="height:20px; width: 300px; text-align:left;" |'''3. [[Rearrange (Maths)|Rearrange]] the equation and [[Solve (Maths)|solve]].'''
<math>9 = 0.75 \times V_s = 9</math>
<math>V_s = 12V</math>
|}