exam Maths Puzzle Numerical Ability

graph please draw a graph y= 2x-3

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One grade of oil has 0.50% of an additive, and a higher grade has 0.75% of the additive. How many liters of each must be used to have 1000 L of a mixture with 0.65% of the additive. a =y
a+4 Make 'a' the subject