Syntel Company Numerical Ability Averages

find the average of reciprocals of x and y :

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reciprocals of x and y = 1/x,1/y
avg of reciprocals of x and y = (1/x + 1/y)/2
=(x+y/xy)/2
=(x+y)/2xy
12 years agoHelpfull: Yes(7) No(0)

Syntel Other Question

Average age of X number of adults in a class is 30yrs. If 12 new adults with avg age of 32 joined with them then the average age increases by one. Find X? An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1 hours, it must travel at a speed of:

A. 300 kmph B. 360 kmph
C. 600 kmph D. 720 kmph