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Study the given information carefully and answer the following questions. Four students i.e. A, B, C and D appeared for written and practical examinations of year 2019-20 The information given below is known: Total Maximum Marks = Maximum marks of written Exam + Maximum marks of practical Exam Total Maximum weighted score = Maximum marks in written exam xx weighted % + Maximum marks in practical exam xx weighted % Weighted score = Marks obtained in written exam xx weighted % + Marks obtained in practical exam xx weighted % Weighted percentage of written exam is 60% and that of practical exam is 40%. Also, maximum marks of written exam is 80 and that of practical exam is 60 It is given that: Total weighted score of A is 52 . Total weighted score of B is 52 and B obtained 55 marks in practical exam. C obtained 50 marks in practical exam. Marks obtained by D in written examination is 70 and D obtained 75% marks in practical exam. If ratio of marks scored by a 5th student X in the written exam and practical exam is 5 : 3 and the weighted score of X is 52.5, then what is the sum of the marks scored by X in written and practical exams?

Study the given information carefully and answer the following questions. Four students i.e. A, B, C and D appeared for written and practical examinations of year 2019-20 The information given below is known: Total Maximum Marks = Maximum marks of written Exam + Maximum marks of practical Exam Total Maximum weighted score = Maximum marks in written exam xx weighted % + Maximum marks in practical exam xx weighted % Weighted score = Marks obtained in written exam xx weighted % + Marks obtained in practical exam xx weighted % Weighted percentage of written exam is 60% and that of practical exam is 40%. Also, maximum marks of written exam is 80 and that of practical exam is 60 It is given that: Total weighted score of A is 52 . Total weighted score of B is 52 and B obtained 55 marks in practical exam. C obtained 50 marks in practical exam. Marks obtained by D in written examination is 70 and D obtained 75% marks in practical exam. If the average marks of A, B, C and D in the practical exam is 47.5 and both A and C scored equal marks in written exam, then what is the average weighted scores of C and D?

One day Kavita went to a jewellers shop with her mother. Her mother gave an old metal jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

Two isotopes P and Q atomic weight 10 and 20 , respectively are mixed in equal amount by weight. After 20 days their weight ratio is found to be 1:4 . Isotope P has a half-life of 10 days. The half-life of isotope Q is

A solid mixture 5 g consists of lead nitrate and sodium nitrate was heated below 600^(@)C until weight of residue was constant. If the loss in weight is 28% find the amount of lead nitrate and sodium nitrate in mixture.