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12 and 9.

Since both have to be multiples of 3 and sum to 21, the only pairs to consider are

3 and 18

6 and 15

9 and 12

Of these, 3 and 18 have an LCM of 18 and 6 and 15 have an LCM of 30.

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Q: What two numbers have an LCM of 36 a GCF of 3 and a sum of 21?
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Related questions

There are two numbers with a GCF of 12 and a LCM of 180 Their sum is 96 What are the two numbers?

60 and 36


If the LCM of two numbers is 200 the gcf is 10 the sum of the numbers is 90 what are the numbers?

40 and 50


What are the two numbers with a LCM of 200 a gcf 10 and the sum is ninety?

40 and 50


What is the GCF of two numbers whose LCM is 30 and whose sum is 16?

The GCF of 6 and 10 is 2.


How do you get the sum of a gcf?

You cannot. LCM{2,6,12} = 12 and GCF{2,6,12} = 2 LCM{4,6,12} = 12 and GCF{4,6,12} = 2 The two sets have the same LCM and GCF but, clearly, their sums are different.


How do you find the LCM using GCF?

The GCF of two numbers multiplied by their LCM will equal the product of the original numbers. If you know the GCF, divide it into the product of the two. The result will be the LCM. If the GCF of two numbers is 1, the LCM is their product.


What is the GCF of two numbers whose sum is 24 and difference is 6?

The GCF of 9 and 15 is 3. The LCM is 45.


Can the GCF of two different numbers is the LCM of the numbers?

No, the only way the GCF and LCM of two numbers can be the same is if the numbers are the same.


What is the product of the GCF and LCM of two numbers?

The product of the GCF and LCM of a pair of numbers is equal to the product of the numbers.


How do you find two numbers if HCF and LCM are known?

The product of the GCF and the LCM of two numbers is equal to the product of the original two numbers. Multiply the GCF and the LCM. The original two numbers will be another factor pair of that total. Find the factor pair that has that GCF and LCM.


Which is greater gcf or LCM?

The LCM of two numbers will never be less than the GCF.


The LCM of the two numbers is 48 If you divide the sum of the numbers by their GCF the result is 5 The average of the two numbers is 20?

Let the two numbers be x and y. Let suppose that the average of two numbers is 20. Then,x + y = 40 and 40/GCF = 5, where GCF = 40/5 = 8Since LCM is 48 and GCF is 8, the numbers are 16 and 24, whose average is 20 is true.