When y=1.3, find the value of 3(y+5.6).
当y=1.3时，求3(y+5.6)的值．
<gadget id="calculator">1.3 + 5.6</gadget>
<output>6.9</output>

<gadget id="calculator">3 * 6.9</gadget>
<output>20.7</output>

<result>20.7</result>