After the No. 1 bus arrives at station A, 4 passengers go down, and 6 passengers come up, and there are 12 passengers on the bus at this time. How many passengers were there in the car before arriving at Station A?
1路公交车到达A站后，下去4位乘客，又上来6位乘客，这时车上有12位乘客．到达A站前车上原来有多少位乘客？
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<result>10</result>