In February 2015, cloudy days were less than sunny days (1/3), and snowy days were less than sunny days (4/5). How many days are there sunny days in this month?
2015年2月份，阴天比晴天少(1/3)，雪天比晴天少(4/5)，这个月晴天有多少天
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/3) + (1/5) + 1</gadget>
<output>28/15 = around 1.866667</output>

<gadget id="calculator">28 / (28/15)</gadget>
<output>15</output>

<result>15</result>