There is a batch of wood. The wood can be used to make 30 tables and 15 beds. Now I have used (1/4) wood to make 2 tables, 2 beds, and 2 stools. How much wood can I make with the rest of the wood? Zhang stool.
有一批木材，木材可以做30张桌子，也可以做15张床，现在做了2张桌子，2张床，2张凳子用了(1/4)的木材，剩下的木材还可以做多少张凳子．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 2</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 2</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(1/4) - (1/15) - (2/15)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) / 2</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(3/4) / (1/40)</gadget>
<output>30</output>

<result>30</result>