Francis' family has 2 ukuleles, 4 guitars, and a certain number of violins. Each ukulele has 4 strings. Each guitar has 6 strings. Each violin has 4 strings. If the total number of strings among the ukuleles, guitars, and violins is 40 strings, how many violins does Francis' family have?
From the ukuleles, there are 2 * 4 = 
<gadget id="calculator">2*4</gadget>
<output>8</output>
8 strings.
From the guitars, there are 4 * 6 = 
<gadget id="calculator">4*6</gadget>
<output>24</output>
24 strings.
From the violins, there are 40 - 8 - 24 = 
<gadget id="calculator">40-8-24</gadget>
<output>8</output>
8 strings.
The total number of violins Francis' family has is 8 / 4 = 
<gadget id="calculator">8/4</gadget>
<output>2</output>
2 violins.

<result>2</result>