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Asif ali Best Answer
At 1400 °C 20 × Vs = 10 × VL-1 VL-1 = 2/3 -----------(1) At 1250°C 5 × Vs = 45 × VL -2 VL -2 = 1/10 ----------(2) ∆VL = ( 2/3-1/10) ×100 = 56.66%