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Explanation:

Let shares of A, B and C be a, b and c respectively.

⇒ a + b + c = 1820

Also, a = 2/5(b + c)
⇒ b + c = 5a/2
Substituting b + c in (1) we get

a + (5a/2) = 1820
⇒ 7a/2 = 1820
⇒ a = 1820 × 2/7 = 520

Hence, option (d).


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