Question 39

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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