The store shipped 15 baskets of apples, each weighing 30 kilograms; and 12 baskets of oranges, each weighing 25 kilograms. How many kilograms did the apples and oranges weigh together?
商店运来15筐苹果，每筐30千克；还运来12筐橘子，每筐25千克．运来的苹果和橘子一共重多少千克？
<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<gadget id="calculator">450 + 300</gadget>
<output>750</output>

<result>750</result>