The school bought back 50 bags of rice and 50 bags of flour each. Each bag of rice was 75 kilograms, and each bag of flour was 25 kilograms. How many kilograms of rice and flour did they buy in total?
学校买回大米和面粉各50袋，大米每袋75千克，面粉每袋25千克，买回的大米和面粉一共有多少千克？
<gadget id="calculator">50 * 75</gadget>
<output>3_750</output>

<gadget id="calculator">50 * 25</gadget>
<output>1_250</output>

<gadget id="calculator">3_750 + 1_250</gadget>
<output>5_000</output>

<result>5_000</result>