First. Two bags of rice in B weigh 24.6 kilograms in total. If 4.5 kilograms are taken out of bag A and put into bag B, the weight of the two bags of rice is equal. How many kilograms of rice is in bag A?
甲．乙两袋大米共重24.6千克，如果从甲袋中取出4.5千克放入乙袋，这时两袋大米质量相等，原来甲袋中有大米多少千克？
<gadget id="calculator">24.6 / 2</gadget>
<output>12.3</output>

<gadget id="calculator">12.3 + 4.5</gadget>
<output>16.8</output>

<result>16.8</result>