There are 57 paintings in the exhibits that are not from the sixth grade, and 65 paintings that are not from the fifth grade. It is known that there are 28 paintings in the fifth and sixth grades. Ask how many paintings are in other grades.
展品中有57幅画不是六年级的，65幅画不是五年级的，已知五、六年级共有28幅，问其它年级共有多少幅画．
<gadget id="calculator">65 - 28</gadget>
<output>37</output>

<gadget id="calculator">57 + 37</gadget>
<output>94</output>

<gadget id="calculator">94 / 2</gadget>
<output>47</output>

<result>47</result>