Xiaogang's family has a box of mooncakes, each mooncake weighs 65 grams, they ate 4 on the first day, which happened to be half of the rest. How many grams does this box of mooncakes weigh?
小刚家有一盒月饼，每个月饼重65克，他们第一天吃了4个，正好是剩下的一半．这盒月饼共重多少克？
<gadget id="calculator">4 * 2 * 65</gadget>
<output>520</output>

<result>520</result>