We need to remember that some of these words in the word problem have meaning when it comes to math.
If we let angle a be the measure of the largest angle, angle b the measure of the second largest angle and angle c the measure of the smallest angle, we can make mathematical statements (equations) from the word problem.
Now "The measure of the largest angle is twice the measure of the second largest." can be written as;
( a ) = 2 ( b )
a = 2b
I have replaced 'measure of the largest angle' with a
and 'is' with '='
and 'twice' with '2'
and 'the measure of the second largest' with b
Now try to create the other statements from this example and you should be able to solve the problem from there.