A and B each have a number of glass balls. If A gives B 20, the number of A's glass balls is B's (2/3). If B gives A 20, then the number of B's glass balls is A's (1/4), how many glass balls are shared by A and B?
甲、乙两人各有玻璃球若干个，如果甲给乙20个，则甲的玻璃球个数是乙的(2/3)，如果乙给甲20个，则乙的玻璃球个数是甲的(1/4)，甲、乙两人共有玻璃球多少个？
<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<result>100</result>