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Option 1 : Either I or II and III
Considering statement I,
Amount of new mixture = 6 + 4 = 10 litres
Sum of ratios = 5 + 7 = 12
Amount of water in 10 litres of new mixture = (5/12) × 10 = (25/6) litres
Considering statement II,
Amount of water in 6 litres of mixture A = (4/9) × 6 = (8/3) litres
Considering statement III,
Amount of water in 4 litres of mixture B = (3/8) × 4 = (3/2) litres
Considering statements II and III,
Amount of water in new mixture = 8/3 + 3/2 = (25/6) litres
∴ The question can be answered using either statement I or statements II and III
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