Question

The average of 4 numbers is 30, if the sum of first 3 number is 85, the fourth
numberis
चार संख्याओं का औसत 30 है यदि पहली तीन संख्याओं का योग 85 है तो चौथी संख्या है।
The​

Answer 1

Answer:

35

Step-by-step explanation:

Average of 4 numbers=30

Sum of 4 numbers=4×30

=120

Sum of First three numbers=85

Therefore,

Fourth Number=Sum of 4 numbers - Sum of 3 numbers

=120-85

=35

Answer 2

Answer:

X1 + X2 + X3 + X4 divided by 4 = 30 ( equation 1)

now , X1 + X2 +X3 + X4 = 120

X1 + X2 + X3 = 85 ( equation 2 )

now , substitute (equation 2) in (equation 1 )

85 + X4 = 120

X4 = 120 - 85

X4 = 35