book Maths Puzzle Numerical Ability

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.

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a vending machine has $41.25 in it. there are 255 coins total and the machine only accepts nickels,dimes and quarters. there are twice as many dimes as nickels.how many of each coi the answer to the following should be 4/3a, however, I cannot understand how - please help! Thank you!!

1/1.5 + 1/1.5=