639 imperial cups in imperial gallons

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

We know (by definition) that: $1\mathrm{brcup}\approx 0.0625\mathrm{imperialgallon}$

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

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

Conclusion: 639 ⁢ brcup ≈ 39.9375 ⁢ imperialgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial gallon is equal to 0.0250391236306729 times 639 imperial cups.

It can also be expressed as: 639 imperial cups is equal to $\frac{1}{\mathrm{0.0250391236306729}}$ imperial gallons.

Approximation

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