Caroline is making some table decorations.

Each decoration is made from a candle and a holder.

Caroline buys some candles and some holders each in packs.

There are 30 candles in a pack of candles.

There are 18 holders in a pack of holders.

Caroline buys exactly the same number of candles and holders.

(i)   How many packs of candles and how many packs of holders

does Caroline buy?