If the average height of boys in a hall is 180 cm and that of girls is 150 cm. If the average height of the gathering is 165 cm, then find the number of girls present in the hall if the number of boys present in the hall are 78 ?

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Answer : 4 78 Explanation : Answer: D) 78 Explanation: Using Trial and error method,we get the number of girls in the hall = 78

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