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This problem trains for: SAT-I, AMC-8, GMAT.

Nine tenths of the animals on a farm are quadrupeds and eight ninths of the animals are bovines. What fraction of the quadrupeds are not bovines?

Of course, it is important to know that bovines are animals with four legs (quadrupeds)!

Denote the number of animals on the farm by n. Then, the number of quadrupeds is:

The number of bovines is:

The number of quadrupeds that are not bovines:

The fraction of quadrupeds that are not bovines: