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Since he said that ABC = FED = 12
Meaning (A-B/B-C/A-C) dimensions
A-B = 12
B-C = 12
A-C = 12
FED dimensions (E-D/D-F/E-F) = 12
E-D = 12
D-F = 12
E-F = 12

Since A = 25 & F = 4X = 12
A = F (bcz ABC = FED)

Finding value of (X):
Since (A-C) = (F-D) = 12 (ABC = FED)
4X = 12
X = 12/4
X = 3 ... The answer is C)
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Finding the value of (y):
25 = (4y - 3)
adding (+3) to both sides of equation
25 + (+3) = (4y - 3) + 3
28 = 4y + 3 - 3
+3 -3 = 0
28 = 4y + 0
28 = 4y
So, y = 28/4
y = 7 ... The answer is B)

Here you go, good luck!