For the first question, the second choice is the answer. Look at position of each letter in the answer choices. If S is the first letter of one of the triangles, G must be the first letter of the other triangle name. You have to "match" the letters.
For the second question, we know the following: A = D = 50 B = E = 30 C = F = ? ("Matching" the order of the letters) The sum of all the angles of a triangle is 180. 180 - 50 - 30 = 100. The third choice is your answer.
