The weight ratio of the two bags of sugar between A and B is 4:1. If 13 kilograms are taken out from bag A and put into bag B, then the weight ratio of the two bags of sugar between A and B is 7:5. Then the weight of the two bags of sugar is and how many kilograms.
甲、乙两包糖的重量比是4：1，如果从甲包中取出13千克放入乙包，这时甲、乙两包糖的重量之比为7：5，那么两包糖重量的和是多少千克．
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(5/12) - (1/5)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">13 / (13/60)</gadget>
<output>60</output>

<result>60</result>