exam Maths Puzzle Numerical Ability

Dave was to inherit 5x as much as Libby. Libby was to inherit 2/5 as much as Hector. The sum that would be shared was $102,000. How much will they each get?

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exam Other Question
2 - 2/3x = 4/5x


I have to find for X, but the choices for answers are
A. 1/11
B. 2/3
C. 15/11

I keep on getting 8/15 though. please help. Find the surface area and volume of a rectangular prism with the given dimensions. Round to the nearest tenth.

1.) e=3.5m,w=2.9m,h=4.7m



Thanks so much