Move [color=#1551b5]both[/color] [color=#c51414]sliders[/color] and create a calculation which you should solve. Insert your [color=#0a971e]solution[/color] into the box. The apples will help you to find the correct solution.

1) What does the letter "[color=#0a971e]a[/color]" mean in the equation? 2) How do you get the [color=#0a971e]solution[/color]? What do you have to calculate?