Question

Express $72$ as a sum of two odd primes.

Answer 1

$72$ can be written as

$72=1+71$ (Cannot be taken as $1$ is neither a prime nora composite number)

$72=2+70$ (Cannot be taken as $2$ is even prime and $70$ is a composite number)

$72=3+69$ (Cannot be taken as $69$ is a composite number)

$72=4+68$ (Cannot be taken as $4$ and $68$ both ares composite number)

$72=5+67$, which clearly is the sum of two odd prime numbers
Therefore, answer is $5$ and $67$.