Vincent can buy flowers in packages of 3 for $2.50 or in packages of 2 for $1. How much money does he save by buying 18 flowers at the better price?
Find how many packages of 3 would be needed which is 18 / 3 = 
<gadget id="calculator">18/3</gadget>
<output>6</output>
6.
The cost of using packages of 3 is 6 * $2.50 = $
<gadget id="calculator">6*2.5</gadget>
<output>15</output>
15.
Find how many packages of 2 would be needed which is 18 / 2 = 
<gadget id="calculator">18/2</gadget>
<output>9</output>
9.
The cost of using packages of 2 is 9 * $1 = $
<gadget id="calculator">9*1</gadget>
<output>9</output>
9.
Vincent would save $15 - $9 = $
<gadget id="calculator">15-9</gadget>
<output>6</output>
6.

<result>6</result>