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If 5A=4B5A = 4B, 7B=3C7B = 3C and 2C=7D2C = 7D, then A : D is :

Solution

Correct Option: 4

From 5A=4B5A=4B: A:B=4:5A:B = 4:5. From 7B=3C7B=3C: B:C=3:7B:C = 3:7. From 2C=7D2C=7D: C:D=7:2C:D = 7:2. Combining: A:B:C=12:15:35A:B:C = 12:15:35, and extending A:B:C:D=12:15:35:10A:B:C:D = 12:15:35:10. Therefore A:D=12:10=6:5A:D = 12:10 = 6:5.

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