self Maths Puzzle

11,20,33,52,81,__

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self Other Question

If 12 men and 16 boys can do a piece of work in 5days and 13 men and 24 boys can do it in 4 days, then what is the ratio of daily work done by a man to that done by a boy ? When Ravi was 8 years old, his father was 31 years old,. Now his father is twice Ravi's age. How old is Ravi now?