Dosi Group bought a batch of wood to be made into tables, chairs, and beds and donated to students in impoverished mountainous areas. Now use (1/4) of this batch of wood to make 2 tables, 2 chairs, and 2 beds. It is known that 30 tables and 15 beds can be made with this batch of wood, so how many chairs can be made with the remaining wood.
多思集团买了一批木材准备做成桌子、椅子、床捐给贫困山区的学生．现在用了这批木材的(1/4)做了桌子、椅子、床各2张．已知用这批木材可以做30张桌子，也可以做15张床，那么剩下的木材还可以做多少张椅子．
<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">(1/15) + (2/15)</gadget>
<output>1/5 = around 0.2</output>

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