There were 146 people in the children's playground in the morning, 87 people left at noon, and another 68 people arrived. How many people are there in the children's playground now? What is the column type.
儿童乐园上午有146人，中午有87人离开，又有68人到来，现在儿童乐园有多少人？列式是多少．
<gadget id="calculator">146 - 87</gadget>
<output>59</output>

<gadget id="calculator">59 + 68</gadget>
<output>127</output>

<result>127</result>