Answer:
10 and 5
6 and 9
11 and 4
Explanation:
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5, 6, 4
10+(?)=15
10 and 15 have a difference of 5
10+5=15
(?)+9=15
9 and 15 have a difference of 6
6+9=15
11+(?)=15
11 and 15 have a difference of 4
11+4=15
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