In the following six fractional formulas, (3/5)+(5/20), (3/6)+(6/20), (3/7)+(7/20), (3/8)+( 8/20), (3/9)+(9/20), (3/10)+(10/20). Which one has the lowest answer? What is its answer.
下面六个分数算式中，(3/5)+(5/20)，(3/6)+(6/20)，(3/7)+(7/20)，(3/8)+(8/20)，(3/9)+(9/20)，(3/10)+(10/20)．哪一个答数最小？它的答数是多少．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<gadget id="calculator">8 / 20</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/8) + (2/5)</gadget>
<output>31/40 = around 0.775</output>

<result>31/40 = around 0.775</result>