11 12 13
18 15 16
25 ? 21
find the value of '?'.
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Answer:
25 - 11 = 14 + 4 = 18
21 - 12 = 9 + 6 = 15
21 - 13 = 8 + 8 = 16.
11 12 13
18 15 16
25 21 21
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