Question

14) The average of three numbers is 5.1f the sum of the first two numbers is 6. then Find the third number​

Answer 1

Answer: The third number = $x = 9$

Solution:

Given:

• Number of terms = 3
• Sum of first two numbers = 6
• Let the third number = $x$
• Average of the three numbers  = 5  = $\frac{Sum \\ of \\ all \\ the\\ terms}{Total \\ number \\ of \\ terms}$

∴ According to the question,

Average = $\frac{Sum \\ of \\ all \\ the\\ terms}{Total \\ number \\ of \\ terms}$

⇒  $5=\frac{6+x}{3}$

⇒ 5 × 3 = 6 + $x$

⇒ 15 = 6 + $x$

⇒ $x =$ 15 - 6

⇒ $x = 9$

Hence, the third number = $x = 9$

Hope you got that.

Thank You.

Answer 2

Answer:

third number is 9

Step-by-step explanation:

6+9=15

15/3 = 5