Citizens are required to participate in juries if called upon primarily to ensure which of the following selections?

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.

a woodchuck would chuck 12.5 wood : 3

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69