On Sunday, Xiaoxiao spent 80 yuan to buy books, which was given by her father (4/5). How much did her father give Xiaoxiao.
星期日，笑笑买书用去80元，是爸爸给的钱的(4/5)，爸爸给了笑笑多少元钱．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<result>100</result>