The scale you see below was loaded with a certain number of [color=#c51414]red packets[/color] on the left tray. Try to balance the scale by loading [color=#1551b5]blue packets[/color] on the right scale using the [color=#1551b5]blue slider[/color] to increase their number. Once you find out how many [color=#1551b5]blue packets[/color] you need you may request a new challenge by clicking the button in the upper left corner.
Solve a few problems and note how many [color=#1551b5]blue packets[/color] you need for different numbers of [color=#c51414]red packets[/color]. How many [color=#1551b5]blue packets[/color] do you need to balance a [color=#c51414]single red packet[/color]?