The concentration of salt water in bottle A is 12%, and the concentration of salt water in bottle B is 32%. When the two bottles of salt water are mixed, the concentration of salt water is 20%. If 10 liters of salt water are taken out from each of the two bottles, and then the remaining salt water is mixed, the concentration of salt water is 19%. How many liters of the original salt water in bottle B?
甲瓶盐水浓度是12%，乙瓶盐水浓度是32%，当两瓶盐水混合时，盐水浓度为20%．如果把两瓶盐水各取出10升，再把剩下的盐水混合，这时盐水浓度为19%．乙瓶原来盐水多少升．
<gadget id="calculator">0.6 / 0.025</gadget>
<output>24</output>

<result>24</result>