exam Maths Puzzle Numerical Ability

Mary has $6.00 in nickels, dimes, and quarters. If she has twice as many dimes as quarters and sixty-five more nickels than dimes, how many coins of each type does she have?

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exam Other Question

Use the midpoint formula method to find the equation of the perpendicular bisector of the line segment whose endpoints are (3,6) and (8,-4). Write the equation in double-intercept I am having problems remembering domains. I need to find the domain of the following:

f(t) = log(t-5)

Is the domain (-infinity, +infinity)?