The results from a liquid limit test are shown below. Liquid limit is defined as the water content where the number of blows is equal to $25.$

$\backslash$table$[[$Blow Count,$14,20,28,34],[$Water Content, $\%,23\mathrm{.}1,22\mathrm{.}3,21\mathrm{.}8,21\mathrm{.}5]]$

It is well known that a linear relationship exists between water content and logarithm of blow count.

Determine the liquid limit for the soil tested.