42 metric teaspoons in US gallons
Result
The conversion result is: 42 metric teaspoons is equivalent to 0.0554761309952112 US gallons.[1]
Conversion formula
How to convert 42 metric teaspoons to US gallons?
We know (by definition) that: 1 brteaspoon ≈ 0.00132086026179074 usgallon.
We can set up a proportion to solve for the number of US gallons.
1 brteaspoon / 42 brteaspoon ≈ 0.00132086026179074 usgallon / x usgallon
Now, we cross multiply to solve for our unknown x:
x usgallon ≈ (42 brteaspoon / 1 brteaspoon) * 0.00132086026179074 usgallon → x usgallon ≈ 0.05547613099521108 usgallon
Conclusion:
42 brteaspoon ≈ 0.05547613099521108 usgallon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US gallon is equal to 18.0257704 times 42 metric teaspoons.
It can also be expressed as: 42 metric teaspoons is equal to 1 / 18.0257704 US gallons.
Approximation
An approximate numerical result would be: forty-two metric teaspoons is about zero point zero six US gallons, or alternatively, a US gallon is about eighteen point zero three times forty-two metric teaspoons.
Footnotes
[1] 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.