Problema Solution
Kelly contracted to paint a house for $640. It took him 20 hours longer than he anticipated. so he earned $1.60 per hour less than he had calculated. How long had he anticipated that it would take him to paint the house?
Answer provided by our tutors
xy=640
(x+20)(y-1.60)= 640
Solving this system of equations yields the solution point (80,8)
Therefore, he had anticipated that painting the house would take 80 hours.