640 US quarts in dry gallons

Conversion formula
How to convert 640 US quarts to dry gallons?

We know (by definition) that: $1\mathrm{usquart}\approx 0.214841751843826\mathrm{drygallon}$

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

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

Conclusion: 640 ⁢ usquart ≈ 137.49872118004865 ⁢ drygallon

Conversion in the opposite direction

The inverse of the conversion factor is that 1 dry gallon is equal to 0.00727279491341991 times 640 US quarts.

It can also be expressed as: 640 US quarts is equal to $\frac{1}{\mathrm{0.00727279491341991}}$ dry gallons.

Approximation

An approximate numerical result would be: six hundred and forty US quarts is about one hundred and thirty-seven point five zero dry gallons, or alternatively, a dry gallon is about zero point zero one times six hundred and forty US quarts.