If 7 times a certain number is subtracted from 630, the remainder is thrice the number. Find the number.

630-7x

To solve this problem, we will set up an algebraic equation. Let's assume the certain number is represented by the variable "x".

According to the problem, when 7 times the certain number is subtracted from 630, the remainder is thrice the number. Mathematically, this can be expressed as:

630 - 7x = 3x

Now, let's solve for x:

First, we can simplify the equation by combining like terms:

630 = 10x

To isolate x, we divide both sides of the equation by 10:

630/10 = x

Simplifying further, we get:

63 = x

Therefore, the certain number is 63.

Now you are going to have to try. I already took this course and do not need the practice.