Question

The average age of a group of 5 boys is
15 yr. If an other boy of 15 yr joins them,
find the average of the whole group.​

Answer 1

Answer:

Hope this helps you please mark this as the brainliest answer and don't forget to follow me.

Step-by-step explanation:

Total age of 30 boys = 30 x 15 = 450

Total age of the rest of boys after the bot aged 20 years leaves = 450 - 20 = 430

Let x be the age of the younger new comer.

Then,

31

430+x+(x+5)

=15

⇒435+2x=31×15=465

⇒2x=30⇒x=15 years

Answer 2

Total Age of 30 boys ..= 450

Age of rest of the boy = 450-20

X = 15 years....

mark as brainlist

♥Hope it helps ♥