The agricultural department at Texas A&M is planting experimental strains of wheat, rice and soybeans. It costs $2.35 per bushel to buy seed wheat, $5.40 bushel to buy seed rice, and $3.60 per bushel to buy soybean seeds. The department purchased 1700 bushels of seed and paid a total of $4837. The amount of wheat purchased was 3.25 times the combined amount of rice and soybeans purchased. How many bushels of each type of seed did they buy?