There are 100 cards in three colors: red, yellow and green. Among them, 1 and 2 are written on the two sides of the red card, 1 and 3 are written on the two sides of the yellow card, and 2 and 2 are written on the two sides of the green card. 3. Now put these cards on the table, let the side with the larger number on each card face up. After calculation, the sum of the numbers displayed on each card is 234. If you turn all the cards over, The sum of the numbers displayed on each card becomes 123, how many green cards are there.
有红、黄、绿3种颜色的卡片共有100张，其中红色卡片的两面上分别写有1和2，黄色卡片的两面上分别写着1和3，绿色卡片的两面上分别写着2和3，现在把这些卡片放在桌子上，让每张卡片写有较大数字的那面朝上，经过计算，各卡片上所显示的数字之和为234，若把所有卡片正反面翻转一下，各卡片所显示的数字之和则变成123，绿色卡片有多少张．
<gadget id="calculator">123 - 100</gadget>
<output>23</output>

<result>23</result>