(3/8) is less than a number (4/8), what is this number?
(3/8)比一个数少(4/8)，这个数是多少？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/8) + (1/2)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>