book Maths Puzzle Numerical Ability

.1166meg ohms/ 1/.22meg ohms + 1/1meg ohms + 1/x
how do I solve for x?

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book Other Question

�50 - 17.5% A building that is 150 ft tall casts a shadow of 20 feet long. At the same time a tree casts a shadow of 2 ft. How tall is the tree?