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.

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