exam Maths Puzzle Numerical Ability

solve 4^(x+5) = 6

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Angela needs 20 quarts of 50% antifreeze solution in her radiator. She plans to obtain this by mixing some pure anitfreeze with an appropriate amount of a 40% solution. How many quarts of each should she use? A worker can do a work in 18 days . An oher worker can do the same work but in 24 days ,and another in 30 days . If the 3 workers work 6 days altogether what part of the work will be done ?