Mr. Chen and Mr. Liu took some children to play in the park. They bought 10 tickets in total. The children’s tickets cost 5 yuan each. How much does it cost to buy children’s tickets?
陈老师和刘老师带一些小朋友去公园玩，一共买了10张门票，儿童票每张5元，买儿童票要多少元钱？
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">5 * 8</gadget>
<output>40</output>

<result>40</result>