21 imperial cups in imperial gallons

Conversion formula
How to convert 21 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: 21 ⁢ brcup ≈ 1.3125 ⁢ imperialgallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 imperial gallon is equal to 0.761904761904762 times 21 imperial cups.

It can also be expressed as: 21 imperial cups is equal to $\frac{1}{\mathrm{0.761904761904762}}$ imperial gallons.

Approximation

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