Question

average of five number is 40 if one number is included then the new number becomes 42 find the new number​

Answer 1

Step-by-step explanation:

Let the new number be x.

(Average of 5 numbers + New number)/2=

Average of 6 numbers.

(40+x)/2=42

40+x=42×2=84

x=84-40

x=44.

The new number is 44.

Answer 2

Answer:

52

Step-by-step explanation:

Let the five numbers be a, b, c, d and e.

Then,

a + b+ c+ d+ e/5 = 40

i.e. a +b + c + d +e = 200    (equation 1)

Let the new number added be x.

then,

a +b +c +d +e +x/6 = 42

a +b +c +d +e +x = 252

Now, from equation 1 we have

200 + x = 252

Therefore,

x = 52.

So the new number added is 52.

Thank You!!