Question

please urgent
solve step by step

Answer 1

Answer:

13(5/7) years

Step-by-step explanation:

Average age of all students

= (15 * 12 + 16 * 15 + 18 * 14)/15 + 16 + 18

= (180 + 240 + 252)/49

= 672/49

= 13.7142

= 13 (5/7) years.

Hope this helps!

Answer 2

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Hello Mate!

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Hope you will find my answer in the list of Brainlest !

Given :

Average ages  of Students in a primary school are the following :

15 Students is 12 years

16 Students is 15 years

18 Students in 14 years

To Find :

Average age of all the Students of a  primary School

$\frac{( 15 * 12 + 16 * 15 + 18 * 14 ) }{ 15 + 16 + 18 }$

$\frac{180 + 240 + 252 }{49}$

$\frac{672}{49}$

$= 13.7142$

$= 13(\frac{5}{7})$ Years

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Hope it helps !!