Josette bought 3 bottles of mineral water for €1.50. How much will four bottles cost?
A bottle costs 1.50 € / 3 = 
<gadget id="calculator">1.50/3</gadget>
<output>0.5</output>
0.50 €.
So, four bottles cost 0.50 € * 4 = 
<gadget id="calculator">0.50*4</gadget>
<output>2</output>
2 €.

<result>2</result>