Subtract a natural number from the numerator of (8/22), add this natural number to the denominator, and the fraction becomes (1/5). What is this natural number?
(8/22)的分子减去一个自然数，分母加上这个自然数，分数就变为(1/5)，这个自然数是多少．
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">30 / 6</gadget>
<output>5</output>

<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<result>3</result>