book Maths Puzzle Numerical Ability

The diameter of the planet Uranius is 10 times larger than mercuries. If the sum of both planets is 54,867 km.What is the diameter of each one.

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book Other Question

Solve each inequality. State the solution set and describe the graph in words.
w^2+3w<18

Thanks a bunch sqrt(54x^8)
I know the x^8 becomes x^4 but the 54 doesn't have an equal square root