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[kirubans]

T4 = 2(625) (V - 4)^3 / (V + 4)^4

T4 = 2(81) / (V-4)

2(81) / (V-4) = 2(625) (V - 4)^3 / (V + 4)^4

81/625 = (V - 4)^4 / (V + 4)^4

3^4/5^4 = (V - 4)^4 / (V + 4)^4

3/5 = (V - 4) / (V + 4)

3V + 12 = 5V - 20

2V = 32

Therefore V = 16

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