Question
The average height of some girls is 127 cm. When 3 boys, with a total height of 321 cm, are included, the average height if the children becomes 122 cm. How many children are there altogether?
3 m

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The average height of some girls is 127 cm. When 3 boys, with a total height of 321 cm, are included, the average height if the children becomes 122 cm. How many children are there altogether?