A can contains a mixture of two liquids A and B in the ratio 7: 5. When 9 litres of mixture are

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3 ай бұрын

A can contains a mixture of two liquids A and B in the ratio 7: 5. When 9 litres of mixture are drawn off and the can is filled with B, the ratio of A and B becomes 7 :9. Litres of liquid A contained by the can initially was:
एक कैन में दो द्रव A और B के मिश्रण का अनुपात 7 : 5 है। जब 9 लीटर मिश्रण को निकाल कर और द्रव B डाला जाता है तो मिश्रण 7 : 9 हो जाता है, तो आरम्भ मे कैन में द्रव A की मात्रा क्या थी?
(a) 10
(b) 20
(c) 21
(d) 25

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