A jar contains a mixture of two liquids a and b in the ratio 7:5 when 9 litres of mixture
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A=7x ,B=5x , Mix.=12x
After removing 9 lit. n filled by B mix.=12x-9
A=7/12(12x-9) ,B=5/12(12x-9)+9
A:B=7:9
solving these x=3
Initial A=7x=7*3=21 Liter
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