There are four batches of visitors in the morning, 15 people in each batch, and the number of visitors in the afternoon is the same as in the morning. How many people came to visit this day?
展览会上午有四批人来参观，每批15人，下午参观的人数和上午同样多．这一天一共有多少人来参观？
<gadget id="calculator">15 * 4 * 2</gadget>
<output>120</output>

<result>120</result>