How many legs does a spider have if it has two times more than double the number of legs a human has?
Since humans have two legs, we start by finding out what double that amount is by performing 2*2=
<gadget id="calculator">2*2</gadget>
<output>4</output>
4.
Spiders have twice that number, so we multiply 4*2 to find 8 legs in total.

<result>8</result>