For two numbers a, b. Define an operation "*", a*b=3a+2b. Then 3*5=how many
对于两个数a、b．定义一种运算"*"，a*b=3a+2b．则3*5=多少
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">9 + 10</gadget>
<output>19</output>

<result>19</result>