A large bed can hold 4 rows with 25 seeds per row, 4 * 25=<<4*25=100>>100 seeds per large bed
100 seeds per large bed and there are 2 beds, 100 * 2= <<100*2=200>>200 seeds needed in total for both large beds.
A medium bed can hold 3 rows with 20 seeds sown per row, 3 * 20=<<3*20=60>>60 seeds per medium bed.
60 seeds per medium bed and there are 2 medium beds, 60 * 2=<<60*2=120>>120 seeds needed in total for both medium beds.
200 seeds needed for the large beds combined with 120 seeds needed for the medium beds comes to 200 +120= <<200+120=320>>320 seeds needed to plant all four beds of the raised garden bed.
#### 320