A tank has a capacity of 30 gallons and is \(\dfrac{5}{6}\) full of water. Jamal then removes \(\dfrac{1}{8}\) of the water in the tank. How many gallons of water are left in the tank?

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The tank is \(\dfrac{5}{6}\) full.

$$ 30\cdot \frac{5}{6} = 25 $$

Removing \(\dfrac{1}{8}\) of the water in the tank.

$$ 25 - 25\left(\frac{1}{8}\right) $$ $$ = 25 - \frac{25}{8} $$ $$ =25 - 3\frac{1}{8} $$ $$ = \boxed{21\frac{7}{8}} $$