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The correct answer is D
Out of 4 numbers, the average of first 3 is 19 and last 3 is 20. If the last number is 21. Find the first number?
The average age of three children is 25 years. If their ages are in the ratio 2:6:7. Find the age of the youngest child.
The average weight of 10 books is 5 kg. If 6 new books are added, the new average increases by 3 kg. What will be the average weight of the 6 new books?