exam Maths Puzzle Numerical Ability

How many liters of a 70% acid solution are needed to be mixed with 18 liters of a 10% acid solution to get a mixture which is 25% alcohol?

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exam Other Question

Use property 1 to simplify all variables represent positive real numbers
(rs)radical sign

(rs)50 Find the unknown in the equation log2 48 = log2(2^x+2 minus 2^x)

Please show me the steps to get to the answer, which is x = 4

Stanbon,, you are the man