Question

Q 9 please answer soon it's urgent ​

Answer 1

Answer:

bhai 27 years hai x ki value find kar 22x+27=80 ab solve kar

Answer 2

$\large{ \bold{ \red{ \underline{ \underline{Question...}}}}}$

the average of (80) people is 22 years. what will be the new average age if one includes a group of (20) faculty members with average age 37...?

$\large{ \bold{ \green{ \underline{ \underline{Answer...}}}}}$

$\large{ \sf{25 \: years}}$

$\large{ \bold{ \red{ \underline{ \underline{Solution...}}}}}$

$\sf{ \purple{ \to \: given...}}$

• No. of initial people=80 Avg. age=22
• No. of people added=20 Avg .Age=37

$\sf{ \purple{ \to \: to \: find.}}$

• Final avg. of all the people

$\large{ \sf{ \to \: u \: must \: know...}} \\ \\ \boxed{ \green{ \sf{ \large{average = \frac{sum \: of \: all \: items}{no. of \: items} }}}}$

$\large{ \sf{ \to \: no. \: of \: peoples = 80}} \\ \\ \large{ \sf{ \to \: average \: age \: of \: all \: people = 22 \: years}} \\ \\ \large{ \green{ \sf{ by \: using \: formula...}}} \\ \\ \large{ \sf{ = > 22 = \frac{sum \: of \: their \: ages}{22} }} \\ \\ \large{ \sf{ = > sum \: of \: their \: ages = 80 \times 22}} \\ \\ \large{ \sf{ \boxed{ = 1760 \: years}}} \\ \\ \large{ \sf{ \to \: no. \: of \: people \: added = 20}} \\ \\ \large{ \sf{ \to \: average \: of \: these \: peoples = 37 \: years}} \\ \\ \large{ \sf{ \green{ by \: using \: formula}}} \\ \\ \large{ \sf{ = > 37 = \frac{sum \: of \: the \: new \: people \: ages}{20} }} \\ \\ \large{ \sf{ = > sum \: of \: the \: new \: ages = 37 \times 20}} \\ \\ \large{ \sf{ \boxed{ = 740}}} \\ \\ \large{ \red{ \sf{ \to \: total \: no. \: of \: people \: now = 80 + 20 = 100}}} \\ \\ \large{ \red{ \sf{ \to \: total \: sum \: of \: their \: ages = 1760 + 740 }}} \\ \large{ \red{ \sf{ \boxed{ = 2500}}}} \\ \\ \large{ \sf{ \purple{ \boxed{ final \: average = \frac{sum \: of \: all \: ages}{total \: no. \: of \: people}}}}} \\ \\ \large{ \sf{ = > avg. \: age = \frac{2500}{100} }} \\ \\ \large{ \sf{ \green{ \boxed{ = > avg. \: age = 25 \: years}}}}$

$\large{ \bold{ \pink{ required \: answer \: is \: 25 \: years}}}$