Kim has 12 nail polishes. Heidi has 5 more nail polishes than Kim, and Karen has 4 fewer nail polishes than Kim. How many nail polishes does Karen and Heidi have together?
Stream of thoughts:
25
Heidi has 12 + 5 = 17 nail polishes.

Karen has 12 - 4 = 8 nail polishes.

Heidi and Karen have 17 + 8 = 25 nail polishes together.

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The final answer: 25