# Scale down as well as up

A continuous length mix has red:grey = 6:9. Show equivalent 2:3 and 4:6 mixes. For total 10 m, find each length. Explain why dividing both terms by three preserves the mix.

**Check:** five equal parts share 10 m, giving 4 m red and 6 m grey. Both terms change by the same nonzero scale factor.