A number plus 25% of it equals (2/3) of 15. What is this number?
一个数加上它的25%正好等于15的(2/3)，这个数是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(2/3) / (5/4)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">15 * (8/15)</gadget>
<output>8</output>

<result>8</result>