average age of 20 boys is 16 years a boy of 35 yrs leave find new average of age
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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, 31430+x+(x+5)=15
⇒435+2x=31×15=465
⇒2x=30⇒x=15 years
Almost same
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