Well. it's possible that the segments are congruent but the other answer aren't as probable.
Answer:
I think the answer is 29.04 cm. squared. Hope this helps!
Assuming that the given expression is

You calculate dy / dx = y' as:
1
-------. y' = e^(x/y) * (-x/y^2)
x + y
=> y' = e^(x/y) * (-x/y^2) * (x + y).
Answer dy / dx = - e^(x/y) (x/y^2) (x+y)
There are 440 boys and 460 girls
Between 5 - 5.5
Hope this helps.