when 3 times a certain number is subtracted from 25,the difference is 28.what is the number?
25 - 3n = 28
Solve for n
25 - 3x = 28
Solve for x.
To solve this problem, let's break it down step by step:
Let's assume the certain number is represented by "x".
First, we know that "3 times a certain number is subtracted from 25". This can be written as:
25 - 3x
Next, we are told that "the difference is 28". In mathematical terms, this means that the expression we just wrote is equal to 28:
25 - 3x = 28
To find the value of "x", we need to isolate it on one side of the equation. Let's do that:
Subtract 25 from both sides:
-3x = 28 - 25
Simplifying the right side:
-3x = 3
Divide both sides by -3 to solve for "x":
x = 3 / -3
Simplifying the right side:
x = -1
Therefore, the certain number is -1.