Question

The average age of 500 people in a group of 750 is 35 years. The average age of the rest is 55. What is the aberage age of all?

Answer 1

Answer:

41.67 Year

Step-by-step explanation:

Total age = 500*35 + (750-500)*55

= 17500 + 250*55

= 17500 + 13750

= 31250

Average of all = 31250/750

= 41.67

Answer 2

Answer:

41.67

Step-by-step solution:

Total people in group =750

500 people average age = 35

250 people average age = 55

Total age of 500 people $= 500X35 = 17500$

Total age of 250 people$= 250X55 = 13750$

Total age of group = 17500 + 13750

$= 17500 + 13750\\\\= 31250$

$Average ~of~ group~ = \frac{Total ~age ~of~ group}{total ~people ~in~group}\\\\=\frac{31250}{750}\\\\= 41.67$