The mean age of 3 women in an office is 35 years old. The mean age of 12 men in an office is 23 years old. What is the mean age (nearest year) of all the people in the office?

25 years

Step-by-step explanation:

To find the mean you need to find the sum of all numbers and divide by the number of terms there are.

In this case you would need to multiply the mean ages by the number of people used to find the mean:

35 * 3 = 105

23 * 12 = 276

Then add the total ages together:

105 + 276 = 381

Then divide by the number of total people in the office:

12 + 3 = 15

381/15 = 25.4

rounded to 25