Divide 581 among A B C so that 4A 5B 7C ........

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Divide 581 among A, B, C so that 4A = 5B = 7C.

145, 278, 178

245, 196, 140

189, 232, 140

None of these

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Explanation:

Let 4A = 5B = 7C = k.
Then,
A = K/4, B = K/5 and C = K/7,
∴ A : B : C = K/4 : K/5 : K/7 = 35 : 28 : 20
∴ A's share = (581 x 35/83) = 245
∴ B's share = (581 x 28/83) = 196
∴ C's share = (581 x 20/83) = 140
Hence,option 2 is the correct answer.