21 imperial cups in US gallons

Conversion formula
How to convert 21 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: 21 ⁢ brcup ≈ 1.5762467772251214 ⁢ usgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US gallon is equal to 0.634418426383991 times 21 imperial cups.

It can also be expressed as: 21 imperial cups is equal to $\frac{1}{\mathrm{0.634418426383991}}$ US gallons.

Approximation

An approximate numerical result would be: twenty-one imperial cups is about one point five eight US gallons, or alternatively, a US gallon is about zero point six three times twenty-one imperial cups.