Let's make an algebra equation to figure this out!
We need to understand that Oscar has x because that is what we are measuring Hannah's number by. Hannah has 16 + 2 times what Oscar has so 16 + 2x.
We know that Hannah plus Oscar's equals 49.
Set it up like this:
(16 + 2x) + (x) = 49
Now distribute.
16 + 3x = 49 (Subtract 16 from each side to leave the variable on the left)
3x = 49 - 16 (Divide both sides by 3 to leave the variable with no multiplier)
x = 33/3 = 11
So Oscar has 11 (x) and Hannah has 38 (2x + 16). 11 + 38 is 49,