Let the supply function for walnuts be p = S(q) = 0:25q + 3:6 dollars per pound. Suppose that the equilibrium price is $5:85; and that the demand is 4 bushels

Have you not heard the following tongue twister Melody?

Peter Piper picked a peck of pickled peppers.
A peck of pickled peppers Peter Piper picked.
If Peter Piper picked a peck of pickled peppers,
Where's the peck of pickled peppers Peter Piper picked?

Well I waanted to know how many pounds that there are in a bushel.

So I looked it up.  I am no wise r about that but I found this

1 imperial bushel = 8 imperial gallons

= 4 imperial pecks

= 36.36872 litres

≈ 8.2565 US dry gallons

≈ 9.6076 US fluid gallons

≈ 2219.36 cubic inches

1 US bushel = 8 US dry gallons

= 4 US pecks

= 2150.42 cubic inches

≈ 9.3092 US fluid gallons

≈ 35.2391 litres

≈ 7.7515 imperial gallons

I never knew where was any such thing a an imperial peck.

 I don't think an imperial peck sounds like a mathematics term.

I hunted down and found the IMPERIAL P****r