exam Maths Puzzle Numerical Ability

please help me!!! evaluate without using a calculater. log7 343?

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4.1X10^4-1X10^3= Michelle had two containers, each containing a mixture of alcohol and disinfectant. One was 40% disinfectant and the other was 80% disinfectant. How much of each should be used to get 600 milliliters of a solution that is 50% disinfectant?