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Using Variable-Object in open-elearning is essential when you need to present dynamic exercise.
A variable present a new challenge each time the learner visits the exercise in a course.

1- Install a Variable-Object

2- Install a text box to write the problem

Write this sentence :
"A bathtub filled with ==fullwater liters of water has a hole that lets out 2 liters per hour.
How much water will be left after 3 hours?"

3- Install a input to write the dynamic answer

Create a dynamic answer :

4- Install a button with a control action