self Maths Puzzle

Find the number of zeroes at the end of 50!

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self Other Question

Ram was asked to multiply a number by 441 and he came with an answer 70229. His
Teacher told him that all the digits except the 2’s in his answer are correct. Which of the following could be the correct answer?

Find the base K of the number system, if (524)8 = (664)K ?