Martha has 11 butterflies in her collection. She has twice as many blue butterflies as yellow butterflies. The rest of her butterflies are black. If Martha has 5 black butterflies, how many blue butterflies does she have?
Martha has 11-5=
<gadget id="calculator">11-5</gadget>
<output>6</output>
6 blue and yellow butterflies.
Martha has 6/3=
<gadget id="calculator">6/3</gadget>
<output>2</output>
2 yellow butterflies.
Martha has 2*2=
<gadget id="calculator">2*2</gadget>
<output>4</output>
4 blue butterflies.

<result>4</result>