Ade spent 1/2 of his pocket money on food and 1/4 of the remainder on comics. If he had N15 left, how much was the pocket money?

Let the total pocket money be $P$.
Ade spent $\frac{1}{2}$ of his pocket money on food.
Amount spent on food $= \frac{1}{2}P$.

The remainder is the total pocket money minus the amount spent on food.
Remainder $= P - \frac{1}{2}P = \frac{1}{2}P$.

Ade spent $\frac{1}{4}$ of the remainder on comics.
Amount spent on comics $= \frac{1}{4} \times (\frac{1}{2}P) = \frac{1}{8}P$.

The money left is the remainder after food minus the amount spent on comics.
Money left $= \frac{1}{2}P - \frac{1}{8}P$.
To subtract these fractions, find a common denominator, which is 8.

We are given that Ade had N15 left.
So, we set the fraction of money left equal to N15:

To find $P$, multiply both sides by $\frac{8}{3}$:

The total pocket money was N40.00.

The calculated pocket money is N40.00, which corresponds to option D.

The final answer is $\text{D. N40.00}$.