Question

thєrє αrє 8 tєαchєrs ín α schσσl . whєn α 35 чєαr σld tєαchєrs wαs trαnfєєrєd αnd αnσthєr tєαchєr jσínnєd thє αvєrαgє αgє wαs íncrєαsєd вч 2 чєαr. lσw σld ís thє nєw tєαchєr​

Answer 1

Average =(Total quantity )/Number of quantity

So
Let the average age of teachers by x

Let y be the age of teacher that joined

So
Total age of 8 teachers age 35 year old one did not leave was = 8x

When 35 years old leave and new one joined then

Total sum of ages = 8x -35 + y

Now
The average of this increased by 2

So
(8x - 35 + y) /8 = x +2
8x - 35 +y = 8x +16
-35 + y =16
y = 35 + 16
y = 51

So

A 51 year old teacher joined the school