exam Maths Puzzle Numerical Ability

A farmer buys 100 live animals for $100. How many of each doe she buy if chicks are .10 each, pigs are 42 and sheep are $5 each?

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exam Other Question

There are two real values of r for which:

(x^4)-(x^3)-(18x^2)+52x+k

has a factor of the form x-r. One of these values is r=2. What is the other value of r?
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what is the equation of the ellipse with foci at (0,-4)and (0,4)and the sum of its focal radii being 10