Beibei and Jingjing originally had the same number of pinballs, but later Beibei bought 35 more, and Jingjing lost 15. At this time, the total number of pinballs between them is 100. May I ask how many pinballs Beibei and Jingjing had at the beginning?
贝贝和晶晶本来有相同数量的弹子球，后来贝贝又买了35颗，而晶晶丢掉了15颗，这时他们两人弹子球的总数是100．请问刚开始时贝贝和晶晶分别有多少颗弹子球？
<gadget id="calculator">35 - 15</gadget>
<output>20</output>

<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<result>40</result>