Question

the average age of the 25boys is 13.6 yrs .what will be the average age ,if15 new boys come whose average age is 13.2yrs join them?​

Answer 1

Answer:

Please see the attachment

Answer 2

$\color {red}\huge\bold\star\underline\mathcal{Question:-}$

We have to find new average ?

$\bold{\boxed{\huge{\boxed{\orange{\small{\boxed{\huge{\red{\bold{\:Answer}}}}}}}}}}$

we know that ,

$\large\red{\boxed{\sf</strong><strong> </strong><strong>average \: = \frac{sum \: of \: observation}{total \: observation}</strong><strong>}}$

so,

sum of 25 boys age = 25 × 13.6 = 340 years

sum of 15 new boys age = 15 × 13.2 = 198 years

so,

Sum of all 40 boys now = 538 years

New average = 538/40 = $\large\red{\boxed{\sf </strong><strong>1</strong><strong>3</strong><strong>.</strong><strong>4</strong><strong>5</strong><strong>\</strong><strong>:</strong><strong>Years</strong><strong>}}$

$\huge\blue{</strong><strong>THANKS</strong><strong>}$