The school distributes 180 books to the fifth and sixth grades. The books distributed to the fifth grade are two-thirds of those of the sixth grade. How many books are there fewer books in the fifth grade than in the sixth grade?
学校把180本书分给五、六年级，五年级分得的图书是六年级的三分之二，五年级比六年级少多少本书？
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">180 * (1/5)</gadget>
<output>36</output>

<result>36</result>