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Answer:
Length of Charlie's brother's room = 8 2/5 feet
Area of Charlie's brother's room = 60 9/10 feet²
Step-by-step explanation:
Width Charlie's room = 7 1/4 = (7 x 4 +1)/4 = 29/4 feet
Length Charlie's room = 10 1/2 = (10 x 2 +1)/2 = 21/2 feet
Length brother's room = 4/5 x 21/2 = (4 x 21)/(5 x 2) = 84/10 = 8 2/5 feet
Area = Length x Width = (42/5 x 29/4) feet² = 1218/20 feet² = 60 9/10 feet²