A number plus 50% of it equals 7.8, find this number.
一个数加上它的50%等于7.8，求这个数．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">7.8 / (3/2)</gadget>
<output>5.2</output>

<result>5.2</result>