6 teachers lead 42 students to play in the park, each adult ticket is 15 yuan, and each child ticket is 6 yuan. How much do they need to buy tickets?
6位老师带领42名学生去公园游玩，成人票每张15元，儿童票每张6元．他们买票一共需要多少元？
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">6 * 42</gadget>
<output>252</output>

<gadget id="calculator">90 + 252</gadget>
<output>342</output>

<result>342</result>