64.5 minus the difference between 24.6 and 30.5, what is the difference?
64.5减去24.6与30.5的差，差是多少．
<gadget id="calculator">30.5 - 24.6</gadget>
<output>5.9</output>

<gadget id="calculator">64.5 - 5.9</gadget>
<output>58.6</output>

<result>58.6</result>