The LCM of two core prime numbers is 80 find the sum of this number

The two numbers which have only 1 as their common factor are called co-primes.

For example, Factors of 5 are 1,5

Factors of 3 are 1,3

Common factors is 1.

So they are co-prime numbers.

To find their LCM, we

then choose each prime number with the greatest power and multiply them to get the LCM.

=>LCM=3×5=15

Hence, LCM of two co-prime numbers is their product.