A bag of flour weighing 2 kilograms can make 80 small steamed buns and 40 steamed buns. Aunt Zhang made 30 small steamed buns with this bag of flour, and she made steamed buns for the rest. How many steamed buns do you make?
一袋重2千克的面粉，全部做小笼包可以做80个，全部做馒头可以做40个，张阿姨用这袋面粉做了30个小笼包，剩下的她全部做馒头，还能做多少个馒头？
<gadget id="calculator">2 / 80</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/40) * 30</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2 - (3/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">2 / 40</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(5/4) / (1/20)</gadget>
<output>25</output>

<result>25</result>