number plus 50% of it equals 7.5. How much is this number?
一个数加上它的50%等于7.5．求这个数是多少？
<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">7.5 / (3/2)</gadget>
<output>5</output>

<result>5</result>