Question

The average of 4number is 48.three of them are 42,50,and56,find the fourth number

Answer 1

Answer:

The fourth number is 44.

Step-by-step explanation:

The average of a group of numbers is their sum divided by the total number of numbers in the group.

Given that the average of 4 numbers is 48. Out of the 4 numbers three of them are given. They are 42,50 and 56.

Let the fourth number be $x$.

Then we have the equation,

$\implies \dfrac{42+50+56+x}{4}= 48\\\\\implies \dfrac{42+50+56+x}{4}=48\\\\\implies \dfrac{148+x}{4}=48\\\\\implies 148+x=48\times 4 \\\\\implies 148+x= 192\\\\\implies x= 192-148= 44$

So the fourth number is 44.

Answer 2

Answer:

Fourth number = 44

Step-by-step explanation:

Given :-

• Average of 4 numbers = 48
• Three numbers = 42,50 and 56

To Find :-

Fourth number

Solution :-

Let,

Fourth term = y

We know that

Average = Sum of terms/Total terms

=> 48 = 42 + 50 + 56 + y/4

=> 48 = 148 + y/4

=> 48 × 4 = 148 + y

=> 192 = 148 + y

=> 192 - 148 = y

=> 44 = y