book Maths Puzzle Numerical Ability

How many liters of a 10% alcohol solution must be added to 80 liters of a 30% alcohol solution to obtain a 15% alcohol solution? Please Help!!!

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The model for body-heat loss depends on the coefficient of convection K, which depends on wind speed s according to the equation Ksquare=16s+4, where s is in miles per hour. Find express the logarithm in terms of log2 M and log2 N: log2 cube root of M^2N