Question

Q15- The average age of group of 14
persons is 40 years. If one more person is
included then average increases by 1.
What is age of new person?​

Answer 1

Answer:

I hope this is helpful to you and please make me brainlist answer please

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