Question

The sum of two prime numbers is 85, what is the product of these two prime numbers? A. 85 B. 91 C. 115 D. 166

Answer 1

the sum is odd, and an odd sum must be composed of an even and an odd number!

so one of the numbers is even and it's prime: it must be 2!
and the other number will be 85-2=83.

and their product is 2*83=166.