At the New Year’s party, there are red, yellow and green balloons hanging in the classroom. The red balloons account for 1/3 of the total number, the yellow ones are 3 less than the red ones (1/5), and the rest are all green. The red ones are 23 fewer than the green ones. So how many yellow balloons are there?
新年联欢会上，教室里挂着红、黄、绿色的气球，红气球占总数的(1/3)，黄色的比红色的(1/5)少3个，其余都是绿色的，又知红色的比绿色的少23个．那么黄色气球有多少个？
<gadget id="calculator">23 - 3</gadget>
<output>20</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) * (1/5)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 - (1/3) - (1/15)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">20 / (4/15)</gadget>
<output>75</output>

<gadget id="calculator">75 * (1/3) * (1/5)</gadget>
<output>5</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<result>2</result>