The school held an art exhibition. The first and second grade exhibited 48 pictures, and the third grade exhibited three times the total number of first and second grade pictures. How many pieces are exhibited in the third grade?
学校举行美术作品展览．一、二年级展出48幅，三年级展出的图画是一、二年级总数的3倍．三年级展出多少幅？
<gadget id="calculator">48 + 48</gadget>
<output>96</output>

<gadget id="calculator">96 * 3</gadget>
<output>288</output>

<result>288</result>