exam Maths Puzzle Numerical Ability

find the distance between points (-6,0) and (-3,1)

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The following graph shows Bob�s salary from the year 2002 to the year 2005. He was hired in the year 2002; therefore t = 0 represents the year 2002 "Arctic Antifreeze" is 18%alchol and "frost No-More" is 10%alchol. How many liters of each should be mixed to get 20L of a mixture that is 15% alchol?