Question 2

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Jambmaths question: 

If 2q35 = 778, find q

Option A: 

4

Option B: 

0

Option C: 

1

Option D: 

2

Jamb Maths Solution: 

$\begin{align}  & 2q{{3}_{5}}={{77}_{8}} \\ & \text{Convert both sides to decimal system} \\ & \text{2}\times {{\text{5}}^{2}}+q\times {{5}^{1}}+3\times {{5}^{0}}=7\times {{8}^{1}}+7\times {{8}^{0}} \\ & 50+5q+3=56+7 \\ & 5q=10 \\ & q=2 \\\end{align}$

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