A carpenter uses 10 1/2 FT of cedar for every 5 2/3 ft of redwood for a construction project if the carpenter uses 5 1/4 of cedar how much redwood does she need ?

A carpenter uses 10 1/2 FT of cedar for every 5 2/3 ft of redwood for a construction project if the carpenter uses 5 1/4 of cedar how much redwood does she need ?