John buys 3 spools of wire that are 20 feet each.  It takes 4 feet to make a necklace.  How many necklaces can he make?
He gets 3*20=
<gadget id="calculator">3*20</gadget>
<output>60</output>
60 feet of wire.
So he can make 60/4=
<gadget id="calculator">60/4</gadget>
<output>15</output>
15 necklaces.

<result>15</result>