A tiger in the zoo weighs 250 kilograms, and a bison weighs twice that of this tiger. How many kilograms does the tiger and bison weigh together?
动物园一只虎重250千克，一头野牛的体重是这只虎的2倍，虎和野牛一共重多少千克？
<gadget id="calculator">250 * 2</gadget>
<output>500</output>

<gadget id="calculator">500 + 250</gadget>
<output>750</output>

<result>750</result>