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In a laboratory,equal number of rats were injected with solution A.In a week ,55%of rats injected with solution A got infected with a disease and of that,equal number of rats were treated with vaccine C and D.Now,percentage of rats treated with vaccine C that recovered was 70%and that with Vaccine D was 50%,where as others died.Calculate,the number of of rats on whom the experiment was carried out in the laboratory,If the number of rats that died even after being treated with vaccine due to disease is 77.

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after striking the floor, a rubber ball rebounds to 4/5th of the height from which it has fallen.find total distance it travels before rest if it dropped from 120 metres. explain?