2013 · Q95
The average weight of a class of 15 boys and 10 girls is 38.4 kg. If the average weight of the boys is 40 kg, then what is the average weight of the girls?
Elementary MathematicsStatistics
- A35 kg
- B35 kg
- C36 kg
- D36 kg
Explanation
(25×38.4−15×40)/10=36. Answer C.