36 liters of diesel fuel is worth €18. The tank of this pickup truck can hold 64 liters. How much does a full tank of diesel fuel cost?
A liter of diesel costs 18/ 36 = 
<gadget id="calculator">18/36</gadget>
<output>1/2 = around 0.5</output>
0.5 €.
64 liters of diesel fuel cost 0.5 X 64 = 
<gadget id="calculator">64*0.5</gadget>
<output>32</output>
32 €

<result>32</result>