exam Maths Puzzle Numerical Ability

Solve:
a) logbase3 27+ logbase3 9-logbase3 81= logbase3 x ( I think the answer is 3)
b) logbase2 8 - logbase2 4=x ( I think the answer is 1)
c) logbase5 6- logbase5 x=logbase5 2 ( I think the answer is 3)

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exam Other Question

The focal length f for a camera lens is related to the object distance o and the image distance i by the formula 1/f = 1/o + 1/i:

Fin the image distance i for an object that is 2,000,000 mm from a 250-mm telephoto lens. If e^(2x)-9e^(x)+18=0 , then the solutions (arranged in increasing order of x) are x=_______and x=________