exam Maths Puzzle Numerical Ability

^ The subject is NATURAL logarithms.
I need help solving this equation:

ln x - ln 5= -1

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exam Other Question

the lenght of the base of a trianle is 3 times the lenght of its altitude. find the length of the base if the area of the triangle is 54m2 1/z + z/9z+81 - 9/z^2+9z