exam Maths Puzzle Numerical Ability

4(n-3)=-16
-3(2n-2)=18

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exam Other Question

A farmer bought 100 animals. He spent $100. Calves are $10, pigs are $3 and chickens are $.50. The farmer cannot remember what he bought and has lost his receipt. With this information, what did he buy?
7/2x+1/2x=3x+3/2+5/2x