Question

Three times a certain number is added to 5 and the result is 20?
What's the number?

Answer 1

5

Explanation:

5*3=15

+5=20

three times a certain number (5) is added to 5 and the result is 20

3*5+5=20

Answer 2

The number is 5

Explanation:

First of all we have to convert the given scenario in mathematical or algebraic expression.

Let x be the number

Then according to given statement, the equation will be:

"Three times a certain number"

`3x`

"is added to 5"

`3x+5`

"the result is 20"

`3x+5 = 20`

Using Subtraction property of Equality

`3x+5-5 = 20-5\\3x = 15`

Using division property of equality

`(3x)/(3) = (15)/(3)\\x = 5`

Hence,

The number is 5