# 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.