exam Maths Puzzle Numerical Ability

two gasahol mixtures are available one contains4.5%alcohol,and the other contains9.75%alcohol.How much of each do you need to mix up 300 liters of gasahol containing 7.25%alcohol

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thank you for your answers to question 129775 but I did a,b,and c on my own and did not come up with your answers so could you please take me step by step through the process, because I am missing something. Could you please help me with this px and the 3 I previously sent. I for got to ask you- sorry

Express the following in set-builder notation: M = {1, 2, 3, 4, 5}