If a certain number is increased by 30%, it becomes 78. What is this number?
某数增加它的30%后是78，这个数是多少．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">78 / (13/10)</gadget>
<output>60</output>

<result>60</result>