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The average height of girls out of a class of is cm and that of remaining girls is cm. The average height of whole class is:
(a) cm
(b) cm
(c) cm
(d) cm

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Important Questions on Average
HARD
BSF GD Constable
IMPORTANT
The average of n numbers is . If is subtracted from any two numbers each, then new average is . The value of is:

HARD
BSF GD Constable
IMPORTANT
The average salary of male employee in a firm is and that of female employees is . The mean salary of all the employees is . The percentage of female employees is:
