Question

The sum of 12 and a certain number is equal to the product of 3 and the number

Answer 1

Read the explanation!

Explanation:

Let the "certain number" be
`x`.

(
`*` is a symbol for multiplication).

Create a few equations and expressions:

The sum of 12 and a certain number:
`12 + x`

The product of 3 and the number:
`3 *x = 3x`

The sum of 12 and a certain number is equal to the product of 3 and the number:

`12 + x` =
`3x`

Solve!

12=3x-x

12=2x

x=6