There are 85 young employees in a certain unit, 68 of whom can ride bicycles and 62 can swim. If there are 12 people who can neither ride a bicycle nor swim, how many people can both swim and ride a bicycle?
某单位有青年员工85人，其中68人会骑自行车，62人会游泳．如果既不会骑车又不会游泳的人有12人，那么即会游泳又会骑车的人有多少？
<gadget id="calculator">85 - 12</gadget>
<output>73</output>

<gadget id="calculator">62 - 73</gadget>
<output>-11</output>

<gadget id="calculator">68 + (-11)</gadget>
<output>57</output>

<result>57</result>