Janet: x + 3
Julie: x
brother: x - 8
Janet + Julie + brother = sum
x + 3 + x + x - 8 = 55
3x - 5 = 55
+5 +5
3x = 60
x = 20
Janet: x + 3 ⇒ (20) + 3 = 23
brother: x - 8 ⇒ (20) - 8 = 12
Answer: Janet=23, Julie=20, brother=12
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