A group of classmates chipped in to buy gifts. If each person pays 10 yuan, there is still a shortage of 20 yuan. If each person pays 2 yuan more, the extra 4 yuan will be added. How many people are in this group?
一个小组的同学凑钱买礼物．若每人出10元，还缺20元．若每人多出2元，则多出4元．这个小组有多少人？
<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>