The difference between the four numbers is (1/80), and their ratio is 1:3:5:7. What is the sum of these four numbers?
四个数依次相差(1/80)，它们的比是1：3：5：7，这四个数的和是多少．
<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">1 + 3 + 5 + 7</gadget>
<output>16</output>

<gadget id="calculator">7 / 16</gadget>
<output>7/16 = around 0.4375</output>

<gadget id="calculator">5 / 16</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">(7/16) - (5/16)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/80) / (1/8)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>