I transport 13 trucks of rice in the morning and 15 trucks of rice in the afternoon, and each truck weighs 28 tons. How many tons of rice will I transport in total on this day?
我上午运大米13车，下午运大米15车，每车重28吨，这一天我共运大米多少吨？
<gadget id="calculator">13 + 15</gadget>
<output>28</output>

<gadget id="calculator">28 * 28</gadget>
<output>784</output>

<result>784</result>