The weight ratio of the two bags of rice in A and B is 7:4. If 12 kg of rice is taken from bag A and put into bag B, then the weight of the two bags of rice is equal. How many kilograms is the original bag of rice?
甲乙两袋大米重量的比是7：4，如果从甲袋取出12千克大米放入乙袋，那么两袋大米的重量相等．甲袋大米原有多少千克？
<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 * (2/3) * 7</gadget>
<output>56</output>

<result>56</result>