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Answer:
x = 30
Step-by-step explanation:
10, 15, 20
15, 22.5, x
10 + (10÷2)
=10 + 5
= 15
15 + (15÷2)
=15 + 7.5
= 22.5
20 + (20÷2)
=20 + 10
= 30