Question

average of 3 number is 7.If if two of number are 5 and 9 find the third number ​

Answer 1

Answer:

The third number is 7

Step-by-step explanation:

GIVEN =

Average = 7

Two numbers are 5,9

Let the third number be X

Now,

Average = $\frac{Sum of given numbers}{Total number of numbers given}$

7 = $\frac{5 + 9 + X}{3}$

21 = 14 + X               [ Cross-multiplication]

21 - 14 = X

7 = X

OR X = 7

Therefore, the third number is 7