During the summer camp, 35 students visited the popular science exhibition. The ticket office stipulates: Tickets for one person are 10 yuan, and tickets for ten people are 70 yuan each. They need at least how many yuan to buy tickets.
在夏令营活动中，35位学生参观科普展览．售票处规定：门票一人券10元，十人券每张70元，他们购买门票至少要多少元．
<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">210 + 50</gadget>
<output>260</output>

<result>260</result>