arithmetic problems :D cools

Level pending

known in the show there are 12 rows of seats. the distance of the first line of stage 50 m and its height (first row) 20 m from the surface of the stage, and the second and third line continues to rise 5 m, if known stage height from the floor is 15 m, then the row height to 10 seats of the floor is?

255 135 215 85

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