13. Three of four numbers have a sum of 22.

the four numbers is 8, what is the fourth number?

-4

Step-by-step explanation:

Given : There are 4 numbers.

The sum of three numbers is 22

The sum of 4 numbers is 8.

To Find : The fourth number.

Solution:

Let first no. be w

Let second no. be x

Let third no. be y

Let fourth no. be z

Since we are given that The sum of 4 numbers is 8.

⇒w+x+y+z=8 - - - (a)

We are also given that the sum of three numbers is 22

⇒w+x+y=22

Now put this value in a

⇒w+x+y+z=8

⇒22+z=8

⇒z = 8-22

⇒z = - 14

Hence, The fourth number z is - 4