Question

Olive oil cost £3.50 for 1 litre how much would 200ml of olive oil

Answer 1

£0.70

Explanation:

1 litre = 1000ml

Method 1:

`\begin{array}{cccc}\£3.50&-&1000ml&\text{divide both sides by 5}\\\\\£0.70&-&200ml\end{array}`

Method 2:

`(\£3.50)/(1000ml)=(x)/(200ml)\qquad\text{cross multiply}\\\\1000x=\£700\qquad\text{divide both sides by 1000}\\\\x=(\£700)/(1000)\\\\x=\£0.70`