Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is :

Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and

1.	Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is :
A.	m 12.1 cm
B.	m 21.1 cm
C.	m 21 cm
D.	m 12 cm
Answer» B. m 21.1 cm

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Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is :

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