The product of (4/5) plus (1/8) multiplied by a number is (1/2). What is this number?
(4/5)加上(1/8)的和乘一个数的积是(1/2)，这个数是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) + (1/8)</gadget>
<output>37/40 = around 0.925</output>

<gadget id="calculator">(1/2) / (37/40)</gadget>
<output>20/37 = around 0.540541</output>

<result>20/37 = around 0.540541</result>