Students donate books to "Project Hope". Sixth grade students donated 200 books in total. The fifth grade students donated 80% of the sixth grade books, and the fourth grade (5/6). How many books did the fourth grade students donate?
同学们为"希望工程"捐书．六年级的同学共捐书200本．五年级同学们捐的书是六年级的80%，是四年级的(5/6)，四年级的同学们捐了多少本？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(4/5) / (5/6)</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">200 * (24/25)</gadget>
<output>192</output>

<result>192</result>