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Let the original other multiplier be x then the original product 12x now the product 21x is solved by 21x-12x=117 x=13 The correct product is 13 x 12=156...

When doing a multiplication formula, Tao Tao wrote the multiplier 12 as 21, and the result was 117 larger than the original product. What is the correct product?

Let the original other multiplier be x then the original product 12x now the product 21x is solved by 21x-12x=117 x=13 The correct product is 13 x 12=156