There are 6 pockets containing 18, 19, 21, 23, 25, and 34 balls respectively. Xiao Wang took 3 of them, and Xiao Li took 2 of them. If the number of balls taken by Xiao Wang is exactly twice the number of balls taken by Xiao Li, what is the number of balls taken by Xiao Wang?
有6个口袋分别装有18、19、21、23、25、34个小球，小王取走了其中的3个口袋，小李取走了其中的2个口袋．若小王拿走的球的个数恰好是小李拿走球的个数的2倍，则小王拿走的球的个数是多少．
<gadget id="calculator">18 + 19 + 21 + 25 + 34</gadget>
<output>117</output>

<gadget id="calculator">0 + 1 + 0 + 1 + 1</gadget>
<output>3</output>

<gadget id="calculator">117 / 3</gadget>
<output>39</output>

<gadget id="calculator">39 * 2</gadget>
<output>78</output>

<result>78</result>