This year's Children's Day, Mr. Li took 42 students to the park. Children's tickets are half price, 2.5 yuan each, and adult tickets are 5 yuan each. How much did they spend on the tickets?
今年儿童节，李老师带着42名同学去游园，儿童门票半价，每张2.5元，成人票每张5元，他们买门票一共要花多少钱？
<gadget id="calculator">2.5 * 42</gadget>
<output>105</output>

<gadget id="calculator">105 + 5</gadget>
<output>110</output>

<result>110</result>