Find a possible pair of prime numbers such that their sum is 90.
The only pair of prime numbers that satisfies this condition is 41 and 49.
To find a pair of prime numbers with a sum of 90, we need to consider prime numbers smaller than 90.
We can start by listing prime numbers smaller than 90:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89
We can then check for pairs of prime numbers that sum up to 90:
17 + 73 = 90
Therefore, one possible pair of prime numbers whose sum is 90 is 17 and 73.