zekedasneak05
contestada

there are 20 children at a library 6 of the children have an average age of five years the remaining children have an average age of 8 years what is the average age of all the children at the library

Respuesta :

musiclover10045
20 total

6 have average of 5 years
6 x 5 = 30

20-6 = 14

14 have average of 8 years

14 x 8 = 112

112 + 30 = 142

142 / 20 = 7.1 years

[tex](6 \times 5) + (14 \times 8) \\ = 142[/tex]

[tex]142 \div 20 = 7.1[/tex]

Average age of all the children at the library
= 7.1

Hope this helps. - M

Otras preguntas