Kindergarten children in the small class were choosing the competition items (rings, beads), 35 people chose the rings, 28 chose the beads, and 10 people chose both. How many people are there in the small class?
幼儿园小班小朋友在选择比赛的项目(套圈、串珠子)，有35人选择了套圈，有28人选择了串珠子，有10人两项都选择了．小班一共有多少人．
<gadget id="calculator">28 - 10</gadget>
<output>18</output>

<gadget id="calculator">35 + 18</gadget>
<output>53</output>

<result>53</result>