Question

X-20% of X=640 can anyone tel me what is the ans and how to do it

Answer 1

To solve the equation X - 20% of X = 640, we follow the steps of converting the percentage to decimal form, combining like terms, and solving for X. The answer is X = 800.

Step-by-step explanation:

To solve the equation, we need to first translate the English statement into a mathematical equation. Let's represent the unknown quantity by X. The equation is given as: X - 20% of X = 640.

To find the answer, we follow the steps:

1. Convert 20% to decimal form: 20% = 0.20.
2. Write the equation using the decimal form: X - 0.20X = 640.
3. Combine like terms by subtracting 0.20X from X: 0.80X = 640.
4. Divide both sides of the equation by 0.80 to solve for X: X = 800.

Therefore, the answer is X = 800.

Learn more about Solving an equation