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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