20 US gallons in US customary cups

Conversion formula
How to convert 20 US gallons to US customary cups?

We know (by definition) that: $1\mathrm{usgallon}\approx 16\mathrm{uscup}$

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

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

Conclusion: 20 ⁢ usgallon ≈ 320 ⁢ uscup

Conversion in the opposite direction

The inverse of the conversion factor is that 1 US customary cup is equal to 0.003125 times 20 US gallons.

It can also be expressed as: 20 US gallons is equal to $\frac{1}{\mathrm{0.003125}}$ US customary cups.

Approximation

An approximate numerical result would be: twenty US gallons is about three hundred and twenty US customary cups, or alternatively, a US customary cup is about zero times twenty US gallons.