Hey!
Let's write the problem.

Add like terms...

Add

to both sides.


Divide both sides by

.

Our final answer would be,

Thanks!
-TetraFish
Step-by-step explanation:
Pythagoras' theorem for the smallest one :


= 52
Pythagoras' theorem for the middle one :
=
+ 
Pythagoras' theorem for the biggest one :


Using the formula before (for
) it becomes :



16 + 8a = 52 + 36
16+8a = 88
8a = 88-16
8a = 72
a = 9
Verifying :



= 117
The biggest one :



True
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1/3 because there are 3 people and only one correct answer