Let's denote the original cost of each puzzle as \( x \).
Molly has 6 grandchildren, so she buys 6 puzzles. If each puzzle is discounted by 50 cents, the cost for each puzzle after the discount is \( x - 0.50 \).
The total amount Molly spent on the puzzles can be expressed as: \[ 6(x - 0.50) = 27 \]
Now, let's solve the equation step by step:
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Distribute the 6: \[ 6x - 3 = 27 \]
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Add 3 to both sides: \[ 6x = 30 \]
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Divide both sides by 6: \[ x = 5 \]
Thus, the original cost of each puzzle is \( \boxed{5} \).