The average age of 25 persons is 30 years. 5 persons are included, then the average age becomes 32 years. Find the average age of new persons.
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The average age of 25 persons is 30 years. 5 persons are included, then the average age becomes 32 years. Find the average age of new persons.

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SOLUTION —

Sum of ages of 25 persons

= 25 x 30 = 750 years

Sum of ages of 30 persons

= 30 x 32 = 960 years

∴ Ages of 5 persons

= 960 – 750 = 210 years

∴ Required average = 210 / 5 = 42 Years.

Hence, average age of new persons is 42 years.

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