The sum of 75% of number A and its (3/5) is 13.5, find number A.
甲数的75%与它的(3/5)和是13.5，求甲数．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/4) + (3/5)</gadget>
<output>27/20 = around 1.35</output>

<gadget id="calculator">13.5 / (27/20)</gadget>
<output>10</output>

<result>10</result>