The school distributes a batch of books to grades 4, 5, and 6. Grade 4 is assigned to Grade 5 (2/3), Grade 5 is assigned to Grade 6 (6/7). If grades 4 and 6 are divided into 220 books, how many more books will the fifth grade have than the fourth grade?
学校把一批书分给四、五、六三个年级，四年级是五年级的(2/3)，五年级是六年级的(6/7)，若四、六两个年级一共分到220本，则五年级比四年级多分到多少本？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(6/7) * (2/3)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 + (4/7)</gadget>
<output>11/7 = around 1.571429</output>

<gadget id="calculator">220 / (11/7)</gadget>
<output>140</output>

<gadget id="calculator">140 * (6/7)</gadget>
<output>120</output>

<gadget id="calculator">120 * (2/3)</gadget>
<output>80</output>

<gadget id="calculator">120 - 80</gadget>
<output>40</output>

<result>40</result>