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The total of the ages of a class of 75 girls is 1050 years the average age of 25 of them is 12 years and that of another 25 is 16 years Find the average age of the remaining girls
- A12 years
- B13 years
- C14 years
- D15 years
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0
CCommunity
Solution
Let there be three groups of 25 girls each having averages a, b and c.
25a+25b+25c=1050
a+b+c=42
Now, a = 12 and b = 16
hence, c = 14
Therefore average age of remaining 25 girls = c = 14 years.
Hence, option C is correct option.
Let there be three groups of 25 girls each having averages a, b and c.
25a+25b+25c=1050
a+b+c=42
Now, a = 12 and b = 16
hence, c = 14
Therefore average age of remaining 25 girls = c = 14 years.
Hence, option C is correct option.
0
CCommunity
Hence, option C is correct option.
0
CCommunity
Solution
Let there be three groups of 25 girls each having averages a, b and c.
25a+25b+25c=1050
a+b+c=42
Now, a = 12 and b = 16
hence, c = 14
Therefore average age of remaining 25 girls = c = 14 years.
Hence, option C is correct option.
Let there be three groups of 25 girls each having averages a, b and c.
25a+25b+25c=1050
a+b+c=42
Now, a = 12 and b = 16
hence, c = 14
Therefore average age of remaining 25 girls = c = 14 years.
Hence, option C is correct option.