Please help me the following:

A drink stall vendor had a total of 56 packets of chrysanthemum tea and soya milk. The ratio of the no. of packets of chrysanthemum tea to the no. of packets of soya milk was 5:3. After he bought 34 more packets of chry santhemum tea and soya milk, the ratio of the no. of packets of chrysanthemum tea to the no. packets of soya milk became 3:2. How many packets of chrysanthemum tea did he buy?

Thank you in advance.