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Answered

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a group of 4 numbers have an average of 15, three of the numbers are 18,11 and 25. what is the other number?? ​

Sagot :

Sqdancefanidn

Answer:

  6

Step-by-step explanation:

The average of a set of numbers is their sum divided by their number. This fact lets us write an equation to find the missing number.

Setup

Let x represent the missing number. The average of the 4 numbers is ...

  (x +18 +11 +25)/4 = 15

Solution

Multiplying by 4 gives ...

  x +54 = 60

Subtracting 54, we find the missing number:

  x = 6

The other number is 6.

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