80 of what number is 40
Understand the Problem
The question is asking us to find a number such that 80% of that number equals 40. To solve this, we will set up the equation 0.8 * x = 40 and solve for x.
Answer
50
Answer for screen readers
The final answer is 50
Steps to Solve
- Set up the equation
We need to find a number such that 80% of that number is 40. Let's denote the unknown number as $x$. The equation will be:
$$0.8x = 40$$
- Solve for $x$
To isolate $x$, divide both sides of the equation by 0.8:
$$x = \frac{40}{0.8}$$
- Simplify the fraction
Perform the division to find $x$:
$$x = 50$$
The final answer is 50
More Information
Here, 80% of 50 is indeed 40, which matches the requirement stated in the problem.
Tips
A common mistake is to incorrectly set up the equation. Ensure you understand that '80% of a number' means multiplying the number by 0.8.
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