Mathematics
NULL
Medium
Question
M boys average b years and n girls average c years. What is the combined average age?
A
(mb − nc)/(m + n) years
B
(mb + nc)/(m − n) years
C
(mb + nc)/(m + n) years
✓ Official correct answer
D
(mb − nc)/(m − n) years
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
(mb − nc)/(m + n) years
No member explanations yet for this option.
B
(mb + nc)/(m − n) years
No member explanations yet for this option.
C
(mb + nc)/(m + n) years
No member explanations yet for this option.
D
(mb − nc)/(m − n) years
No member explanations yet for this option.
Explanation
Combined average = (mb + nc)/(m + n) years.