SAT Math Multiple Choice Practice Question 123: Answer and Explanation
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Question: 123
13. 
Each box in the shape above is a square. If the total area of the shape is 48 square units, then the length of AB is
A. 5 units
B. 10 units
C. 20 units
D. 40 units
E. 80 units
Correct Answer: B
Explanation:
B. The figure contains 12 squares, so each one has an area of 48 ÷ 12 = 4 and, thus, each side has a length of 2. Because AB covers 5 sides, its length is 10.