If you read 6 pages of a book every day, you can finish reading it in 20 days. If you want to finish reading it 8 days in advance, how many more pages should you read every day? (Solve with ratio)
一本书每天读6页，20天可以读完，要提前8天读完，每天应多读几页？(用比例解)
<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<gadget id="calculator">6 * 20</gadget>
<output>120</output>

<gadget id="calculator">120 - 120</gadget>
<output>0</output>

<gadget id="calculator">48 + 0</gadget>
<output>48</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<result>4</result>