Jambmaths question:
Evaluate ${{\left( \frac{6}{0.32}\div \frac{2}{0.084} \right)}^{-1}}$ correct to 1 decimal place
Option A:
1. 3
Option B:
2.5
Option C:
4.6
Option D:
3.2
Jamb Maths Solution:
$\begin{align} & {{\left( \frac{6}{0.32}\div \frac{2}{0.084} \right)}^{-1}}={{\left( \frac{6}{0.32}\times \frac{0.084}{2} \right)}^{-1}} \\ & {{\left( \frac{6}{0.32}\div \frac{2}{0.084} \right)}^{-1}}={{\left( \frac{6}{\tfrac{32}{100}}\times \frac{\tfrac{84}{1000}}{2} \right)}^{-1}} \\ & {{\left( \frac{6}{0.32}\div \frac{2}{0.084} \right)}^{-1}}={{\left( \frac{6\times 100}{32}\times \frac{84}{1000\times 2} \right)}^{-1}} \\ & {{\left( \frac{6}{0.32}\div \frac{2}{0.084} \right)}^{-1}}=0.7875 \\\end{align}$
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