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in a group of cows and ducks the number of legs are 24 more than twice the heads. what is the number of cows? what is the answer of the question?

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Maths Other Question

the age of father is three times more than his son, if after three year the age of father will be ten time more than his son than what is the age of son at present 13,17,21,23,29,35,33,41,49,.........
find next 2 numbers???