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40 litres of 60% concentration of acid solution is added to 35 litres of 80% concentration of acid solution. What is the concentration of acid in the new solution?

60% सांद्रता वाले 40 लीटर अम्ल घोल को 80% सांद्रता वाले 35 लीटर अम्ल घोल में मिलाया जाता है। नए घोल में अम्ल की सांद्रता कितनी होगी?

66% 66 2/3% 69 1/3% 69%

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