It is known that c=2a+b, when a=3, b=5, how much is c=.
已知c=2a+b，当a=3，b=5时，c=多少．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<result>11</result>