book Maths Puzzle Numerical Ability

6(x/2-4) = 21+6x

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juan can mow and trim the lawn in 3 hours working alone. his siter Maria can mow and trim the lawn in 5 hours workin alone. if they work together, how long would it take them to fi How does the problem (3x to the fourth power y to the third power)(4x to the fourth power y) work.