With this information, you can calculate the quantity of leagues 21 miles is equal to.
¿What is the inverse calculation between 1 league and 21 miles?
Performing the inverse calculation of the relationship between units, we obtain that 1 league is 0.14285714 times 21 miles.
Which is the same to say that 21 miles is 7 leagues.
Twenty-one miles equals to seven leagues. *Approximation
A league is zero times twenty-one miles. *Approximation
