Meg is making costumes for the 30 members of the Rainbow Dancers, for their annual show. The costumes can be made in a variety of colour combinations, as shown in the following table. The table also shows the number of dancers who will have each variety of costume. Each costume can be made from exactly 2 m of material. The material comes in 30 m rolls and Meg buys one roll in each of red, yellow, green and blue