Q: What are 2 numbers that have an LCM of 75 and HCF of 5?

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You cannot. The numbers 2 and 12 have hcf = 2 and LCM = 12 The numbers 4 and 6 also have hcf = 2 and LCM = 12 So if you just knew the hcf and LCM you would not know which of the two was the required pair.

HCF of 17 and 68 is 17 ..( Lowest Prime factor ) LCM Of 102 and 476 is 7*2^2*3*17 which is 1428 .. ==> Sum of HCF and LCM are 1428+17= 1445 .

2 and 12

2 and 20

2 and 12

2 and 20 have an HCF of 2 and an LCM of 20. You could also use 4 and 10.

HCF of 20 means the two numbers have common prime factors of 2, 2 and 5. However, LCM of 535 means that both of the numbers are odd. This cannot be the case if they have a prime factor of 2. Thus two numbers cannot have 20 as hcf and 535 as lcm.

6 and 10 2x3=6 2x5=10 HCF=2 LCM=30

2 and 12

How about 4 and 6

3 and 30.

The answer is 4 and 10.