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QR Challenge: Rectangles

Question	Answer
13 + 5 =	18
12 + 4 =	16
15 + 5 =	20
20 + 4 =	24
16 + 6 =	22
14 + 7 =	21
11 + 5 =	16
10 + 8 =	18
20 – 6 =	14
13 – 4 =	9
15 – 3 =	12
17 – 6 =	11
18 – 5 =	13
12 – 4 =	8
10 – 5 =	5
16 – 3 =	13