A storage silo for grain can house 18,000 bushels of grain. Answer the following questions using the fact that 1 ton equals to 2000 pounds.

1) Given that one bushel of oats weight 32 pounds, how many tons of oats can be stored in the silo?

2) Given that one bushel of barley weighs 48 pounds, how many tons of barley can be stored in the silo?

3) Given that one bushel of wheat weighs 60 pounds, how many tons of wheat can be stored in the silo?