Xiao Ding’s family bought a box of grapes, ate half of it on the first day, and ate the remaining half on the second day. At this time, there were still 3 kilograms left. How many kilograms did this box of grapes originally weigh?
小丁家买了一箱葡萄，第一天吃掉了一半，第二天吃掉了剩下的一半，这时还剩3千克，这箱葡萄原来有多少千克？
<gadget id="calculator">3 * 2 * 2</gadget>
<output>12</output>

<result>12</result>