Helpp I'm lost I know it's easy but not for me

11

Step-by-step explanation:

Using the Pythagorean theorem we can solve this problem.

Pythagoras' theorem= hyp^2-side^2

There are 2 sides in this right-angled triangle. Let's name one side "side a" and the other "side b". Side b is what we'll be finding for.

Hypotenuse= 12

Side a= 5

Side b=?

But in this case we already know the value of the hypotenuse so we have to find for a side.

side^2= hyp^2-side^2

Side^2= 12^2-5^2

Side b= 144-25

Side b= 119

Side b= √119

Side b= 11

Therefore Side b= 11

there will be 35 boys in each team. : )