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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Can someone please help me with this word problem?
Suppose you invest $12,000 in two funds paying 10.5% and 13% smple interest. The total anual interest is $1447.50. How much is i DIFFERENCIATION:
IF Y=1/1+X,SHOW THAT
(1+X)d2y/dx2+2dy/dx=0