Wilfred eats 4 carrots on Tuesday and 6 carrots on Wednesday. If Wilfred wants to eat a total of 15 carrots from Tuesday to Thursday, how many carrots does Wilfred need to eat on Thursday?
Across Tuesday and Wednesday, Wilfred eats 4 + 6 = 
<gadget id="calculator">4+6</gadget>
<output>10</output>
10 carrots.
On Thursday, Wilfred needs to eat 15 - 10 = 
<gadget id="calculator">15-10</gadget>
<output>5</output>
5 carrots.

<result>5</result>