exam Maths Puzzle Numerical Ability

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Greatest common factor
-18a^3,3a^4

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1) Working alone, Coleen can paint a house in 2hr less than James. Working together, they can paint the house in 10hr. How long would it take James to paint the house? A car dealership has been selling new cars for $600 over the selling price. Sales have been 80cars/month. Due to inflation the $600 is increasing. For every $10 increase they will