Question

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

Answer 1

Answer:

Average = 7

Sum of numbers= 7×3=21

1st no = 5

2nd no = 9

Let the third no be x

$\frac{5 + 9 + x}{3} = 7 \\ 14 + x = 7 \times 3 \\ x = 21 - 14 \\ x = 7$

Jai Shree Ram

Answer 2

Answer:

Let three numbers be a ,b,c

let a=5,b=9,c=?

average of three numbers =(a+b+c)/3 =9

==>(5+9+c)/3 =7

==>(14+c)/3 =7

==>14+c=21

==>c=21-14

==>c=7

Therefore third number is 7

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