Teachers and students of Qianjin Primary School donated 216 books to the disaster area this year, which is twice the amount of last year. How many books were donated last year?
前进小学师生今年给灾区捐赠216本图书，是去年的2倍．去年捐赠多少本图书？
<gadget id="calculator">216 / 2</gadget>
<output>108</output>

<result>108</result>