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<p><p>A, B and C entered into a partnership by investing in the ratio of 7:4:5. At the end of the year, the total profit is in the ratio of 21:4:10. Find the ratio of period of time they invested in the business.</p></p>

A 2:3:2

B 2:1:2

C 3:1:2

D 1:2:3

E 3:2:1

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