The store originally had 45 boxes of milk, sold 28 boxes in the morning, and shipped another 45 boxes in the afternoon. How many boxes of milk are there in the store at this time?
商店原有牛奶45箱，上午卖出28箱，下午又运进45箱，这时商店有多少箱牛奶？
<gadget id="calculator">45 - 28</gadget>
<output>17</output>

<gadget id="calculator">17 + 45</gadget>
<output>62</output>

<result>62</result>