There are two art interest groups, A and B, with 4 people in group A drawing 20 pictures each, and 6 people in group B making 90 pictures in total. How many pictures did each person draw on average in groups A and B?
甲、乙两个美术兴趣小组，甲组4人每人作画20张，乙组6人共作画90张．甲、乙两组平均每人作画多少张？
<gadget id="calculator">4 * 20</gadget>
<output>80</output>

<gadget id="calculator">80 + 90</gadget>
<output>170</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">170 / 10</gadget>
<output>17</output>

<result>17</result>