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Q: What 2 numbers have LCM of 20 and HCF of 2?

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2 and 20

The answer is 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.

20 and 300 60 and 100

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.

No.

2 and 12

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 12

How about 4 and 6

3 and 30.

3 and 30

5 and 6

6 and 4

77 and 1

2 and 12

2 and 30

None. But 4 and 6 have a LCM (not LMC) of 12 and HCF of 2.

LCM of two numbers = their product divided by their HCF. The HCF of 64 and 610 is only 2 so the LCM is 64 x 610/2 ie 19520.

12 and 2 4 and 6

Since the product of two numbers is equal to the product of their GCF and LCM, the GCF of two numbers is equal to their product divided by their LCM and their LCM is equal to their product divided by their GCF.

Yes.

They are 9 and 6

The LCM of 3, 15 and 36 is 180.