639 imperial cups in dry gallons

Conversion formula
How to convert 639 imperial cups to dry gallons?

We know (by definition) that: $1\mathrm{brcup}\approx 0.0645035464680438\mathrm{drygallon}$

We can set up a proportion to solve for the number of dry gallons.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 639 ⁢ brcup ≈ 41.21776619307998 ⁢ drygallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 dry gallon is equal to 0.0242613827085052 times 639 imperial cups.

It can also be expressed as: 639 imperial cups is equal to $\frac{1}{\mathrm{0.0242613827085052}}$ dry gallons.

Approximation

An approximate numerical result would be: six hundred and thirty-nine imperial cups is about forty-one point two one dry gallons, or alternatively, a dry gallon is about zero point zero two times six hundred and thirty-nine imperial cups.