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Mixing Paints

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Experiment with different combinations of paints A and B (and paints C and D).

The ratio $1:4 = 2:8 = 3:12 = 4:16$ ...

The ratio $1:5 = 2:10 = 3:15 = 4:20$ ...

B is whiter than A (and D is whiter than C), so what will be special about the combinations that achieve the paler shades of pink?

What is the relationship between the ratios of the original paints and the ratio of the mix?