The average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. What is the average height of the whole class?

The average height of 30 girls out of a class of 40 is 160 cms and tha

1.	The average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. What is the average height of the whole class?
A.	155 cm
B.	157 cm
C.	159 cm
D.	None of these
Answer» D. None of these

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The average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. What is the average height of the whole class?

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