Explanation:
This can be solved using an algebraic expression.
The following equation uses the variable n for the number we need to find, 16 as the number given, and 54 as the sum of everything in the equation.

Combine like terms

subtract 16 on bother sides

2n + 0 = 38
can also be written as:

now divide both sides by 2 to cancel out the 2 in "2n"

n = 19
Plug the new n into the equation

Determine if true by solving
Add what's in parentheses
19 + (19+16) = 54
Add the remaining
19 + 35 = 54
The equation is true
54 = 54
So your two numbers are 19 and 35