the product of two 2 digit number is 1998. if the product of their units digits is 28 and that of tens digits is 15 ,find the number.
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Factor 1938.
1938 = 2 x 969 = 2 x 3 x 323 = 2 x 3 x 17 x 19.
The two desired numbers are products of these factors.
Since the product of the unit's digits is 28, a little trial inspection
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