How to convert 216 US customary teaspoons to US gallons?
We know (by definition) that:
We can set up a proportion to solve for the number of US gallons.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US gallon is equal to 3.55555555555556 times 216 US customary teaspoons.
It can also be expressed as: 216 US customary teaspoons is equal to US gallons.
An approximate numerical result would be: two hundred and sixteen US customary teaspoons is about zero point two eight US gallons, or alternatively, a US gallon is about three point five six times two hundred and sixteen US customary teaspoons.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.