Question

The average of four numbers is 42. Three of the numbers are 26,42 and 32. Find the fourth number

Answer 1

Let the number be x,
Now,
average =
$\frac{26 + 42 + 32 + x}{4} = 42 \\ \frac{100 + x}{4} = 42 \\ 100 + x = 168 \\ x = 68$
Therefore the fourth number is 68.

Answer 2

The fourth number will be "68". Further explanation is given below.

Step-by-step explanation:

Given :

The three numbers are 26, 42 and 32.

Let the fourth number be "x".

If, the average of four numbers is equal to 42, then

⇒  $\frac{26+42+32+x}{4} = 42$

⇒  $\frac{100+x}{4} = 42$

⇒  100+x = 42×4

⇒  100+x = 168

⇒  x = 168-100

⇒ x = 68

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