times the sum of a number and 10 is 25. What is the number?
一个数与10的和的2倍是25，这个数是多少．
<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">(25/2) - 10</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>