exam Maths Puzzle Numerical Ability

Transpose V = 2R/R-r so that r is the subject

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exam Other Question

If you could, please help me with this problem.
thanks

2
-------- +2
x + 4
------------------------
3
------- + 1
(x + 4) Word Problem:

Your relative wants to pick apples from the tree pictured below. Given that the tree casts a shadow of 30 ft. when your 6 ft. neighbor casts a shadow of 10 ft., how long should a latter be to reach the top of the tree?