There are two cups of the same size. Cup A is filled with pure water, and Cup B is filled with half a cup of salt water containing 10 grams of salt. Fill the cup with salt water and stir well, the above process is regarded as an operation. If five consecutive operations are carried out in this way, how many grams of salt are contained in Cup A? (expressed in fractions)
有两个同样大小的杯子，甲杯盛满了纯水，乙杯盛着半杯含有10克盐的盐水，先用甲杯里的水倒满乙杯并搅匀，然后再将乙杯里的盐水倒满甲杯并搅匀，上述过程算是进行了一次操作．如果这样连续地进行了五次操作后，那么甲杯里含有多少克盐？(用分数表示)
<gadget id="calculator">855 / 256</gadget>
<output>855/256 = around 3.339844</output>

<gadget id="calculator">10 - (855/256)</gadget>
<output>1_705/256 = around 6.660156</output>

<result>1_705/256 = around 6.660156</result>