How Many Lies Has Pinocchio Told Today?

Algebra Level 1

Every time Pinocchio tells a lie, his nose grows one inch longer.

When he left this morning, Pinocchio's nose was only 3 inches long. However, when he arrived home for dinner, his creator Geppetto noticed that his nose was now 9 inches long.

How many lies did Pinocchio tell while he was away?

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