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Hints

1. Define the expected oven time in minutes

Define a constant which should contain the number value specified in the recipe.
export the constant.

2. Calculate the remaining oven time in minutes

Explicitly return a number from the function.
Use the mathematical operator for subtraction to subtract values.

3. Calculate the preparation time in minutes

Explicitly return a number from the function.
Use the mathematical operator for multiplication to multiply values.
Use the extra constant for the time in minutes per layer.

4. Calculate the total working time in minutes

Explicitly return a number from the function.
Invoke one of the other methods implemented previously.
Use the mathematical operator for addition to add values.