In a certain group, the average (arithmetic mean) age of the males is 28, and the average age of the females is 30. If there are 100 people in the group, how many of them are males?
(1) The average age of all 100 people is 28.9
(2) There are 10 more males than there are females.
Average age of men and women
Correct
Hard
0:24
1:50