216+64*42/28.
216+64*42/28．
<gadget id="calculator">42 / 28</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">64 * (3/2)</gadget>
<output>96</output>

<gadget id="calculator">216 + 96</gadget>
<output>312</output>

<result>312</result>