An iron hoop is 11.49 decimeters long, which just makes a hoop of a wooden barrel. It is known that the iron hoop joint is 0.5 decimeters. What is the outer diameter of this wooden barrel in decimeters?
一根铁箍长11.49分米，正好做成一个木桶的一道箍．已知铁箍接头处是0.5分米．这个木桶的外直径是多少分米？
<gadget id="calculator">11.49 - 0.5</gadget>
<output>10.99</output>

<gadget id="calculator">10.99 / 3.14</gadget>
<output>3.5</output>

<result>3.5</result>