book Maths Puzzle Numerical Ability

the answer to the following should be 4/3a, however, I cannot understand how - please help! Thank you!!

1/1.5 + 1/1.5=

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A scientist has to make 800ml of 61% sulfuric acid solution. He has available a one liter bottle of 40% sulfuric acid solution and a one liter bottle of 75% sulfuric acid solution. Please help me solve this question:(4h^5-9^3+4)+(6h^5-9h+4)