exam Maths Puzzle Numerical Ability

How many milliliters of alcohol must be added to 200 milliliters of a 25% iodine solution to make a 10% iodine solution

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exam Other Question

solve LOGa(8x+5) =LOGa(4x+29)

the a is lower than the word LOG. What does this mean?

Someone pleeze help
(20x)/(102-x) for 0<=x<=100