(1/8) of a certain number minus 20 is equal to its (1/10) plus 20, what is the certain number?
某数的(1/8)减去20等于它的(1/10)加上20，某数是多少？
<gadget id="calculator">20 + 20</gadget>
<output>40</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">40 / (1/40)</gadget>
<output>1_600</output>

<result>1_600</result>