exam Maths Puzzle Numerical Ability

I have a question regarding Orseme's geometric graphical model?

the sum of 1/2 + 2/4 + 3/8 + ... + n/2^n + ... = 2.

I can't figure out how to prove this.

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exam Other Question

if a stick that is 13 inches long casts a shadow of length 16 inches at the same time an office buildings shadow is 85 ft. long, how tall is the building? Round to one decimal place. A pound is equal to 16oz. What fractional part of a pound is 6 oz?