There are several piles of Go pieces, each pile has the same number of pieces, and white pieces account for 36%. Xiaoming took half of the first pile (all black pieces), and Xiaoguang mixed all the remaining Go pieces together and found that the number of white pieces accounted for exactly 40%. You know how many piles of chess pieces there are.
有若干堆围棋子，每堆棋子数一样多，且白子占36%．小明从第一堆中取走一半(全是黑子)，小光把余下的所有围棋子混放在一起后发现白子数恰好占40%．你知道原来有多少堆棋子．
<result>5</result>