RRB NTPC Mains or Stage 2 Model Paper 7 with solutions

Question : 29 of 120

Marks: +1, -0

The total of the ages of a class of 75 girls is 1050, the average age of 25 of them is 12 yrs and that of another 25 is 16 yr. Find the average age of the remaining girls.

12 yrs
13 yrs
14 yrs
15 yrs

Validate

Solution:

={1050 (25× 12 +25× 16)}/25

={1050- (300+ 400)}/25

={1050-700}/25= 14 years

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