There are 158 red balloons and yellow balloons in total. If 12 red balloons are sold, the number of the two balloons will be the same. How many red balloons are there?
红气球和黄气球共158个，如果红气球卖出12个后，两种气球个数就同样多，红气球有多少个？
<gadget id="calculator">158 + 12</gadget>
<output>170</output>

<gadget id="calculator">170 / 2</gadget>
<output>85</output>

<result>85</result>