The canteen brings in 8 bags of flour and 8 bags of rice, each bag of rice is 50 kg, and each bag of flour is 30 kg. How many kilograms does the rice and flour weigh together?
食堂运来面粉、大米各8袋，每袋大米50千克，每袋面粉30千克．大米和面粉一共重多少千克？
<gadget id="calculator">50 + 30</gadget>
<output>80</output>

<gadget id="calculator">80 * 8</gadget>
<output>640</output>

<result>640</result>