When x=3, y=1.5, 5x+2y=how much.
当x=3，y=1.5时，5x+2y=多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">2 * 1.5</gadget>
<output>3</output>

<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<result>18</result>