Teacher Wang and Teacher Li led 48 students to visit the science and technology exhibition, and bought tickets for 770 yuan. It is known that each adult ticket is 25 yuan, how much is each child ticket?
王老师和李老师带领48个学生参观科技展览，购买门票共用去770元．已知每张成人票25元，每张儿童票多少元？
<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">770 - 50</gadget>
<output>720</output>

<gadget id="calculator">720 / 48</gadget>
<output>15</output>

<result>15</result>