Answer:
£6,000
Explanation:
"Split in a ratio of 2:5 between the area and Phillip Cage" means that arena got 2 parts and Phillip Cage got 5 parts.
Hence, in total there are 2 + 5 = 7 parts
Also, the total money is £21,000
Each part is worth

"How much money did the arena make from Phillip Cage’s concert?"
The arena got 2 parts and each part is worth £3000, so arena made
pounds