Subtract the sum of 24.8 and 18.6 from a number to get 65.9, find this number.
一个数减去24.8与18.6的和得65.9，求这个数．
<gadget id="calculator">24.8 + 18.6 + 65.9</gadget>
<output>109.3</output>

<result>109.3</result>