Whats the difference between constant variables, and independent variables.

The independent variable is the one that is changed/controlled by the scientist. To ensure a fair test, a good experiment has only one independent variable. ... Experiments also have constants or controlled variables. Controlled variables are things that a scientist wants to remain the same throughout the experiment.

Explanation:

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miss jennifer is buying pencils in packs of 12, notebooks in packs of 16, and red pens in boxes of 20. she needs to have the same number of pencils, notebooks, and red pens. how many packs of each type should she buy?

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