book Maths Puzzle Numerical Ability

I have $100 to purchase 100 animals. Their cost is.....

Chickens = $0.50
Goats = $3.50
Sheep = $10.00

How many of each animal is purchased to reach the 100 animals required

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book Other Question
Write the point -slope form of the line with slope 5 containing the point
(3, -2). Can someone help please?

Can these equations be solved?
w + x + y + z = 60
w = 1/2(x + y +z)
x = 1/3(w + y+ z)
y = 1/4(w + x + z)

Thanks
geocee