In August of a certain year, rainy days are less than sunny days (1/3), cloudy days are less than sunny days (3/5), how many sunny days are there in this month?
某年的8月份中，雨天比晴天少(1/3)，阴天比晴天少(3/5)，这个月晴天有多少天？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/3) + (2/5) + 1</gadget>
<output>31/15 = around 2.066667</output>

<gadget id="calculator">31 / (31/15)</gadget>
<output>15</output>

<result>15</result>