There are 18, 19, 21, 23, 25 and 34 balls in the six pockets respectively, one of which is filled with cracked balls, and the other five pockets have no cracked balls. Now Xiao Wang took three of the bags, Xiao Ding took two bags, and only the bag with the cracked ball remained. If Xiao Wang got twice as many balls as Xiao Ding got, how many balls with cracks are there?
六个袋内分别有18、19、21、23、25与34个球，其中一个袋内装的都是有裂口的球，其余五个袋内都没有带裂口的球．现在小王拿了其中三个袋，小丁拿了两个袋，只剩下那个装有裂口球的袋．如果小王得到的球数是小丁得到的两倍，那么有裂口的球是多少个．
<result>23</result>