On Children's Day, teachers and students in the Garden Expo had a discount on tickets. Teacher Li led everyone to play. The 4 tickets only cost 36 yuan. Teacher Li spent a total of 72 yuan on the tickets. How many people did they go?
六一儿童节，园博园师生购票优惠，李老师带领大家去玩，4张票只需要36元，李老师买票共花了72元，他们一共去了多少人？
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<result>8</result>