1988 AJHSME Problems/Problem 18
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Problem
The average weight of 
boys is 
pounds and the average weight of 
girls is 
pounds. The average weight of the 
children is
Solution
Let the boys have total weight 
and let the girls have total weight 
. We are given
We want the average of the children, which is 
From the first two equations, we can determine that 
and 
, so 
. Therefore, the average we desire is 
See Also
| 1988 AJHSME (Problems • Resources) | ||
| Preceded by Problem 17 | Followed by Problem 19 | |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | ||
