The former term of a ratio is 3, and the latter term is the reciprocal of the former term. If the former term is increased by 9, how much should the latter term be increased to keep the ratio unchanged.
一个比的前项是3，后项是前项的倒数，若前项增加9，要使比值不变，后项要增加多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 4</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/3) - (1/3)</gadget>
<output>1</output>

<result>1</result>