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A=5B................(1)
A=3C................(2)
A+B+C=1380......(3)
Putting values of B and C from 1 and 2 in 3, we get
⇒A + (A/5) + (A/3) = 1380
⇒ (15A+ 3A + 5A)/15 = 1380
⇒23A= 1380×15
⇒A = 1380×15/23 = 900
hence B=A/5 = 90/5 = 180
C=A/3 = 90/3=300
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