Question

If a two digit positive number is multiplied by its unit digit, then the product is 189. If the ten's digit is twice
of the unit digit then the positive number is

Answer 1

If a two digit positive number is multiplied by its unit digit, then the product is 189 and if the tens' digit is twice of the unit digit, then calcutate the unit digit. Let the unit digit =x, ∴ tens's digit =2x. ∴ the number =10×2x+x=20+x=21x.

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