Question

the mean of two numbers is 13.If one of them is 20,find the other.​

Answer 1

Given:

• The mean of two numbers = 3
• One number is = 20

To find:

• Other number

Procedure :

• $13 = \frac{20 + x}{2} \\ 13 \times 2 = 20 + x \\ 26 = 20 + 6 \\ x = 26 - 20 \\ x = 6$

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Answer 2

Answer:

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Step-by-step explanation:

Given:

there are 2 numbers one of them is 20.mean of these two number are 13.

To find:

second number

steps:

$let \: another \: number \: be \: x \\ \boxed{mean \: of \: numer = \frac{sum \: of \: all \: the \: outcome}{totel \: number \: of \: outcome} }$

$\Rightarrow \: 13 = \frac{20 + x}{2} \\ \Rightarrow13 \times 2 = 20 + x \\ \Rightarrow26 = 20 + x \\ \Rightarrow \: x = 26 - 20 = 6 \\ \\ \bold{ \bf \: 6 \: is \: the \: second \: number}$