Question 15

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Jambmaths question: 

W is directly proportional to U. If W =5 when U = 3. Find U when W =$\tfrac{2}{7}$

Jamb Maths Solution: 

$\begin{align}  & W\propto U \\ & W=KU \\ & \text{When }W=5,U=3 \\ & 5=3K \\ & K=\tfrac{5}{3} \\ & \text{When }W=\tfrac{2}{7} \\ & \tfrac{2}{7}=\tfrac{5}{3}U \\ & U=\tfrac{2}{7}\times \tfrac{3}{5}=\tfrac{6}{35} \\\end{align}$

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