Question

the average of 4numbers is 30 lf the sum of first 3numbers is 85 the fourth number is ​

Answer 1

Answer:

the fourth number is 35

Step-by-step explanation:

the sum of first three numbers is 85

(85+x)/4=30

85+x=30*4

85+x=120

x=120-85

x=35

Answer 2

Answer:

fourth number =35

Step-by-step explanation:

Given :

The average of 4 numbers = 30

The sum of first three numbers = 85

To find:

Fourth number

Solution:

We know that

Average = sum of all observations/ no. of all observations

average of 4 numbers = 30

sum of 4 numbers = 30×4=120

sum of first three numbers= 85

Sum of 4 Numbers=

sum of first 3 numbers+ 4th number

Fourth number =

Sum of 4 numbers- Sum of first 3 numbers

4th number = 120-85=35

Answer:

4th Number= 35