Question

Write an equation for each situation and then solve your equation.

A number is multiplied by 20, The result is 200.


A number is multiplied by 3 and then subtracted by 7, You have 1.

Answer 1

Q1. 20x = 200. The value of x is 10

Q2. 7 - 3x = 1. The value of x is 2.

Explanation:

In order to find an equation, you have to let the number be any variable, such as m or n or z. So I will let the number be x variable. Then the question says a number is multiplied by 20 is equals to 200 :

Let number = x,

`x * 20 = 200`

`20x = 200`

`20x / 20 = 200 / 20`

`x = 10`

Same for the next question. Given that a number multiplied by 3 :

Let number = x,

`x * 3 = 3x`

Then subtracted by 7 equals to 1 :

`7 - 3x = 1`

`7 - 3x - 7 = 1 - 7`

`- 3x = - 6`

`- 3x / - 3 = - 6 / - 3`

`x = 2`