Question

The arithmetic mean of the ages of 20 boys is 13 years, 4 months and 5 days.

Find the sum of their ages. One of the boys is of exactly 15 years. What is the average age of the remaining boys?

Answer 1

Change 13 years, 4 months and 5 days to years. Multiply that answer by 20 and that will be the sum of their ages. Now subtract 15 and divide the result by 19, and that will be the average age of the remaining boys.

Answer 2

13 years + 1/3 year + 1/73 year = 13 76/219 years.
20(13 76/219) = 261 121/219 years

Answer 3

261 121/219 - 15 = 246 121/219

Answer 4

I would like to ask how did you change 5 days into years? diveide by 36 right? 5/360 ? = 1/72

Answer 5

divide*

Answer 6

246 121/219 divided by 19 = 12 4063/4161

Answer 7

5/365

Answer 8

Why 365?

Answer 9

There are 365 days in 1 year

Answer 10

Oh ohkay.

Answer 11

Before computers, in the business world, they used 1 year = 360 days but not any more.

Answer 12

I'm getting 13.26 as the answer.

Answer 13

Thank you for the help Mertsj and Happy new year :)

Answer 14

I got 12 .98 but I did not check my calculations yet.

Answer 15

Also, do you have to give the answer in years, months, and days as it was given you?

Answer 16

No, it's just the average. But if I want to express in months years and days how do i?

Answer 17

Yep. I redid it and got 13.26 just as you did.

Answer 18

Okay now if I want to express in months years and days how do i?

Answer 19

Take .26 times 365 and that would be the number of days. Then change that to months and days.

Answer 20

13 years 3 months and 5 days.

Answer 21

Good job!!

Answer 22

Thanks. :)

Answer 23

Happy New Year.

Answer 24

Same to you :)

Answer 25

happy new year