What is the difference between (7/8) of 6 minus the quotient of 1.8 divided by (9/20)?
6的(7/8)减去1.8除(9/20)的商，差是多少？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">6 * (7/8)</gadget>
<output>21/4 = around 5.25</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(9/20) / 1.8</gadget>
<output>0.25</output>

<gadget id="calculator">(21/4) - 0.25</gadget>
<output>5</output>

<result>5</result>