Question

the average age of three sisters is 15 if the ages of two sisters are 12 and 15 years the age is third is​

Answer 1

Answer:

Since we know that the average of the given numbers is 15. is 18. Therefore, the age of the third sister is 18.

Make me as brainliest

Answer 2

Answer:

The age is third sister is 18 year .

Step-by-step explanation:

Given  -

The average age of three sisters is 15.

The ages of two sisters are 12 years and 15 years

To find -

The age is third sister.

Solution -

Average means ration of the sum of all value to the number of values given

The age of third sister is x .

As per given information ,

Average of all sister = $\frac{Sum\: of\: all \:ages \:of \:sister}{3 sister}$

Put the given value in these

$15 = \frac{12+15+x}{3}$

$15 \times 3 = 12+15+x$

$45 = 27+x$

$x = 45 -27$

$x =18$

∴  The age is third sister is 18 year.