(480/75)/(120/□)=4. □How much can you fill in?
(480/75)/(120/□)=4．□能填多少．
<gadget id="calculator">480 / 75</gadget>
<output>32/5 = around 6.4</output>

<gadget id="calculator">(32/5) / 4</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">120 / (8/5)</gadget>
<output>75</output>

<result>75</result>