A walrus weighs about 1.13 tons, a polar bear is 0.48 tons lighter than a walrus, and a beluga is 0.5 tons heavier than a polar bear. How many tons does a beluga weigh?
一头海象体重大约是1.13吨，北极熊的体重比海象轻0.48吨，白鲸比一只北极熊重0.5吨，一头白鲸重多少吨？
<gadget id="calculator">1.13 - 0.48</gadget>
<output>0.65</output>

<gadget id="calculator">0.65 + 0.5</gadget>
<output>1.15</output>

<result>1.15</result>