the average age of 7 boys is 15 years one more boys joins them and the

1.	the average age of 7 boys is 15 years one more boys joins them and the average age now becomes 14 years Find the age of the boy who joins last
Answer» Question :- The average age of 7 boys is 15 years one more boys joins them and the average age now becomes 14 years Find the age of the boy who joins last ? ___________________________________________ Answer :- From the Question :- • Total Number of boys = 7 • Average age of boys = 15 years. $\sf{ \red{average = \frac{sum \: quantities}{no \: of \: quantities} }{} }{}$ $15 = \frac{sum \: ages \: of \: 7boys}{7} \\ \\ 105 = sum \: ages \: of \: 7 \: boys -( 1)$ Now, • Another boy joins and the avarge is 14 • Let present age of boy who join last be ' y years ' • From the Question we KNOW that, $14 \: years = \frac{sum \: ages \: of \: 7boys + y}{8} \\ 112 = sum \: ages \: of \: 7 \: boys \\ \\ newly \: joined \: boy \: age = 7years$ Hence the Age of newly joined boy = 7 years

the average age of 7 boys is 15 years one more boys joins them and the average age now becomes 14 years Find the age of the boy who joins last

Answer»

Question :-

The average age of 7 boys is 15 years one more boys joins them and the average age now becomes 14 years Find the age of the boy who joins last ?

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From the Question :-

• Total Number of boys = 7

• Average age of boys = 15 years.

$\sf{ \red{average = \frac{sum \: quantities}{no \: of \: quantities} }{} }{}$

$15 = \frac{sum \: ages \: of \: 7boys}{7} \\ \\ 105 = sum \: ages \: of \: 7 \: boys -( 1)$

Now,

• Another boy joins and the avarge is 14

• Let present age of boy who join last be ' y years '

• From the Question we KNOW that,

$14 \: years = \frac{sum \: ages \: of \: 7boys + y}{8} \\ 112 = sum \: ages \: of \: 7 \: boys \\ \\ newly \: joined \: boy \: age = 7years$

Hence the Age of newly joined boy = 7 years