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?
Heidi has 12+5 = <T>add(12, 5)=17 nail polishes.
Karen has 12-4 = <T>subtract(12, 4)=8 nail polishes.
Heidi and Karen have 17+8 = <T>add(17, 8)=25 nail polishes together.
