There are two cold storages, A and B. The temperature of A cold storage is -4°C, and the temperature of B cold storage is -15°C. How much is the temperature of A cold storage higher than that of B cold storage?
有甲、乙两冷库，甲冷库的温度是-4℃，乙冷库的温度是-15℃，则甲冷库的温度比乙冷库的温度高多少℃．
<gadget id="calculator">(-4) - (-15)</gadget>
<output>11</output>

<result>11</result>