Play a two-player game where the winner gets 2 points, the loser loses 1 point, and there is no tie. If A wins 4 sets, and B's final total score is 6 points. How many games did they play in total?
玩一种两人游戏，赢者得2分，输者失1分，没有平局．如果A赢了4盘，而B最终的总分为6分．他们一共玩了多少盘游戏．
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<result>9</result>