In 1 pint, there are 16 ounces. Thus, 64 pints can be converted to ounces as follows:
This means that the bushel is equivalent to 1024 ounces.
Since there are 16 jars in 1 crate, we have the following:
Divide the number of ounces in 5 bushels by the number of ounces in a crate.
Therefore, the farmer must have 16 crates.