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The product of two 2 digit numbers is 2028 and their HCF is 13. What are the numbers ?
26, 78
39, 52
13, 156
36, 68
Let the numbers be 13x and 13y
(? HCF of the numbers = 13) 13x × 13y = 2028 => xy = 12 co-primes with product 12 are (1, 12) and (3, 4)
(? we need to take only co-primes with product 12. If we take two numbers with product 12,
but not co-prime, the HCF will not remain as 13) Hence the numbers with HCF 13 and product 2028 = (13 × 1, 13 × 12) and (13 × 3, 13 × 4) = (13, 156) and (39, 52) Given that the numbers are 2 digit numbers Hence numbers are 39 and 52
Hence, option 2 is the correct answer.
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