25% of a number plus the quotient of 12 divided by 24, the sum is 3.5, what is this number?
一个数的25%加上12除以24的商，和是3.5，这个数是多少．
<gadget id="calculator">12 / 24</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.5 - (1/2)</gadget>
<output>3</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / (1/4)</gadget>
<output>12</output>

<result>12</result>