Three consecutive even numbers, the first number is (7/8) of the third number, what is the second natural number?
三个连续的偶数，第一个数是第三个数的(7/8)，第二个自然数是多少？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

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

<gadget id="calculator">4 / (1/8)</gadget>
<output>32</output>

<gadget id="calculator">32 - 2</gadget>
<output>30</output>

<result>30</result>