Time how long it takes to paint 10 sq ft.
To paint 2000 sq ft would therefore take 200 times as long.
With a roller on a prepared wall and a competent painter then 10 sq ft could be painted in less than 1 minute so 2000 sq ft would take 3 -4 hours.
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Multiply 3 and 5 to get a Least Common Multiple. 15. So you find how many rooms can Alvin paint in 15 hours (5 rooms). Same with Bernie (3 rooms). That means they can paint 8 rooms in 15 hours. Since you want to find "how long it would take," you flip the rate over. In 15 hours they can paint 8 rooms. Reduce if you want, 15/8= 1.875 hour to paint one room.
45 days
Assuming all of the 4 people worked at the same pace originally, it would take two people 6 days.
about how many years would it take for $1000 to become $2000 with an interest rate of 7.2
5000 ÷ 2000 = 2.5 hours