exam Maths Puzzle Numerical Ability

A man can construct a wall in 20 hrs. With the help of his apprentice assistant the task would take 12 hrs. How long would it take the apprentice, working alone, to construct the wall?

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exam Other Question
A reduced fat cookie contains 5 grams fat per serving. In order for food to be 'reduced fat', it must have at least 15% less fat than the regular item. What can you conclude abou how would you graph this equation

x>3
y<-2