Question

Average age of group of 16 boys is 21 years. 2 boys with ages of 15 years and 18 years left the group. One boy with age 24 years joined the group. What is the new average age ( in years) of the group?
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Answer 1

Answer:

21.8

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

x/16=21 { Let the sum of ages be x }

x=336

336-(15+18)=336-33=303 { As 2 boys of ages 15 and 18 left the group }

303+24=327 { As 1 boy of age 24 years joined }

Total Number of boys = [16-2]+1=14+1=15{ As 2 boys left and 1 boy joined}

327/15=21.8

Thus, The average age is 21.8 years.