Question

The average of 3 numbers is 7 andaverage of First two numbers is4. what is the third number? Please explain. ​

Answer 1

Step-by-step explanation:

Let x , y and z are the given numbers.

We have,

x+y+z=7

and

x+y=4

now,

4+z=7 (because x+y=4)

therefore, z=7-4=3 is. the required answer.❤️