Answer:
a=4, b = 12
Explanation:
This is a relatively simple question once you break it down. Make two equations based on the rectangles given:
64 = 4b + 4a
56 = 8a + 2b
64 = 4b + 4a => 64 = 4 (b+a) => 16 = b + a
isolate for a variable (any will do I just chose b)
16 - a = b
56 = 8a + 2b => 56 = 2(4a + b) => 28 = 4a + b
isolate for b then plug in equation
28 - 4a = b
16 - a = 28 - 4a
28 - 16 = -a + 4a
12 = 3a
4 = a
16 - a = b
b = 16 - 4
b = 12
Assuming my math is right, this should be your answer