Answer:
There are many to do this, but the simplest way is to put the fractions into a calculator (16*14)+9 ÷ 16 = 14.5625 . and (16*11)+13 ÷16 = 11.8125
If they are looking for which one is higher? The birdhouse.
If they want the difference? Subtract one from the other = 2.75 units
Explanation: