If 4x+3=11, then 0.5x+4.5=how much.
如果4x+3=11，那么0.5x+4.5=多少．
<gadget id="calculator">11 - 3</gadget>
<output>8</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">0.5 * 2</gadget>
<output>1</output>

<gadget id="calculator">1 + 4.5</gadget>
<output>5.5</output>

<result>5.5</result>