639 imperial cups in US gallons

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

We know (by definition) that: $1\mathrm{brcup}\approx 0.0750593703440534\mathrm{usgallon}$

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

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

Conclusion: 639 ⁢ brcup ≈ 47.96293764985012 ⁢ usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 0.020849431852995 times 639 imperial cups.

It can also be expressed as: 639 imperial cups is equal to $\frac{1}{\mathrm{0.020849431852995}}$ US gallons.

Approximation

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