This year grandma’s age is 8 times that of Xiaohong’s, and last year’s grandma’s age is 9 times that of Xiaohong’s. Guess how old Xiaohong is this year?
今年奶奶的岁数是小红的8倍，去年奶奶的岁数是小红的9倍．猜一猜小红今年几岁？
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">8 / 7</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<gadget id="calculator">9 / 8</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">(8/7) - (9/8)</gadget>
<output>1/56 = around 0.017857</output>

<gadget id="calculator">1 / (1/56)</gadget>
<output>56</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">56 * (1/7)</gadget>
<output>8</output>

<result>8</result>