Question

34. The average of five numbers is 30. If the sum of first four numbers is 85, the fifth number is​

Answer 1

Average of all numbers = 30

Sum of all four number = 85

Let fifth number be x

Total number = 5

we know, average = sum of all observation/number of observation

=>30 = 85+x/5

=> 30×5 = 85+x

=> 150-85 = x

=> x = 65

so, the fifth number is 65.

Answer 2

Answer:

hope it helps .... if yes mark as brainiest ...

Step-by-step explanation:

let the no. be X,Y,Z,A,B

AV =Sum of no. /total no.

30=X+y+z+a+b/ 5

30=85+b /5 (sum of 4 no. )

30*5=85+b

150-85=b

b=65