book Maths Puzzle Numerical Ability

Find the number where by three quarters of it is 5% more than two less than that .

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book Other Question

what is the eccentricity of the hyperbola given by 3x^2-5y^2=45? i need help with these problems as well please.

It asks me to find any real number for the following?? I am confused on what that means.. here is the problem:

r-4 divided by 7-r