Question

The average age of group of 20 girls is 15 years and that of another group of 25 boys is 24 years. The average age of the two groups mixed together is​

Answer 1

Step-by-step explanation:

According to the question

The average age of 20 girls is = 15 years

The average age of 25 boys is = 24 years

∴ Mixed average = 20×15+25×2445

= 300+60045

= 90045=20 years