"Six One" Children's Day, supermarkets offer 20% discount on supplies for primary school students, and use the original money to buy 12 pencils, how many "Six One" Children's Day can buy.
"六一"儿童节，超市对小学生用品八折优惠，用原来买12支铅笔的钱，"六一"儿童节可买多少支．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 * (4/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">12 / (4/5)</gadget>
<output>15</output>

<gadget id="calculator">1 * 15</gadget>
<output>15</output>

<result>15</result>