Calculation: 2*2+5*6+7*8=how much.
计算：2*2+5*6+7*8=多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">4 + 30 + 56</gadget>
<output>90</output>

<result>90</result>