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1 Answer

+1 vote

Find the opposite value according to:
12 x 4 - 4 x 4 = 32
17 x 4 – 4 x 4 = 52
21 x 4 – 4 x 4 = 68
10 x 4 – 4 x 4 = 24
Hence the number 24 will replace the question mark.