Question

the average of 3numbers is 7 if average of 2 numbers is 5 . then find the third number​

Answer 1

Answer:

let's assume the three numbers as x,y and z

now the average of three numbers given as 7 so

Step-by-step explanation:

(x+y+z)/3=7

and average of two numbers as 5 so

(x+y)/2=5

so

x+y+z=21

x+y=10

so

z+10=21

z=11

so third number is 11

Answer 2

Answer:

The answer to this question is...