At a historical landmark, candles are used to simulate an authentic atmosphere. A volunteer is currently putting new candles in the candle holders. On the east side, he replaced candles in 18 small candle holders and 15 large candle holders, using a total of 159 candles. On the west side, he replaced the candles in 3 small candle holders and 10 large candle holders, for a total of 79 candles. How many candles does each candle holder hold?