Math
posted by Tyler
A painter needs 3 days to paint the walls of a room. How long would it take him, working at the same rate, to paint a room that is twice as long, twice as wide, and twice as high as the original room?

drwls
The area of all the walls scales with the square of the linear dimension, as they remain similar in shape but increase in size. Doubling all the linear dimensions multiplies tha total area by 4. Painting the enlarged room therefore takes 4 x 3 = 12 days.

Lramirez
At an automotive repaire shop, 3.5 h of labour costs $311.50.
a) What is the labour charge a 5h job?
b) How could you check you answer? 
Riley
it would take 24 days
Respond to this Question
Similar Questions

Math
A painter needs 3 days to paint the walls of a room. How long would it take him, working at the same rate, to paint a room that is twice as long, twice as wide and twice as high as the original room? 
Intermediate Algebra
Joe can paint a room in 6 hours while Sue can paint the same room in 5 hours. Working together, how long would it take them to paint the room? 
math
If painter A can paint a room in three hours by themselves, and painter B can paint the same room in four hours, and painter C can paint the same room in six hours, how long will it take for all three to paint the room together if … 
Geometry
a room is 18 feet long and 14 feet wide with walls 10 feet high. If one can of paint covers 450 square feet, how many cans of paint would be needed in order to paint the four walls? 
Geometry
A gallon of paint costs $20 and covers 465 square feet. Three coats of paint are recommended for even coverage. The room to be painted is 12 feet high, 20 feet long, and 20 feet wide. Only 4 gallons of paint are left to paint the room. … 
Math
If a room is 13 feet long and 12 feet wide. The ceiling is 8 ft high. I want to paint all 4 walls. If a can of paint covers 100 sq ft, how many cans of paint will I need? 
Math
Jayce wants to paint her room Duke Blue.Her room is 12 ft long ,12 ft 10inches wide, and 10ft high.If Dylan insists she paint her ceiling white, about how many cans of blue paint will she need to buy to paint the walls.One can covers … 
Math help please
A painter used 1 1/2 gallons of paint to paint 3/4 of a room. At this same rate, how many gallons will it take to paint the whole room? 
Algebra
Sally can paint a room in 4 hours while it takes Steve 7 hours to paint the same room. How long would it take them to paint the room if they workedâ€‹ together? 
Math
Bill wants to paint the ceiling and four walls of his bedroom. The room is 6.0 m long, 3.0 m wide and 2.4 m high. Paint comes in 4 L cans. One litre of paint covers 10 m2. What area does Bill need to paint?