In the ratio 12:7=48:28, if the second item increases its (1/7), then the third item must decrease its amount, so that the ratio can be established.
在比例12：7=48：28中，如果第二项增加它的(1/7)，那么第三项必须减少它的多少，比例才能成立．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">7 * (1/7)</gadget>
<output>1</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">48 * (7/8)</gadget>
<output>42</output>

<gadget id="calculator">48 - 42</gadget>
<output>6</output>

<gadget id="calculator">6 / 48</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>