There are 100 passengers, 10 of them understand neither English nor Russian, 75 understand English, 83 understand Russian, how many people understand English and Russian?
有100位旅客，其中有10人既不懂英语，又不懂俄语，有75人懂英语，83人懂俄语，懂英语又懂俄语的有多少人？
<gadget id="calculator">75 + 83</gadget>
<output>158</output>

<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<gadget id="calculator">158 - 90</gadget>
<output>68</output>

<result>68</result>