(1/4) of a certain number plus 2.5 is equal to its (1/3), find a certain number.
某数的(1/4)加上2.5与它的(1/3)相等，求某数．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2.5 / (1/12)</gadget>
<output>30</output>

<result>30</result>