# Question: 800 is 20 percent of what number?

## Step by step solution for calculating 800 is 20 percent of what number

We already have our first value 800 and the second value 20. Let's assume the unknown value is Y which answer we will find out.

As we have all the required values we need, Now we can put them in a simple mathematical formula as below:

STEP 1 800 = 20% × Y

STEP 2 800 = 20/100× Y

Multiplying both sides by 100 and dividing both sides of the equation by 20 we will arrive at:

STEP 3 Y = 800 × 100/20

STEP 4 Y = 800 × 100 ÷ 20

STEP 5 Y = 4000

Finally, we have found the value of Y which is 4000 and that is our answer. You can easily calculate 800 is 20 percent of what number by using any regular calculator, simply enter 800 × 100 ÷ 20 and you will get your answer which is 4000 Here is a Percentage Calculator to solve similar calculations such as 800 is 20 percent of what number. You can solve this type of calculation with your values by entering them into the calculator's fields, and click 'Calculate' to get the result and explanation.

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## Sample questions, answers, and how to

Question: Your friend has a bag of marbles, and he tells you that 20 percent of the marbles are red. If there are 800 red marbles. How many marbles does he have altogether?

How To: In this problem, we know that the Percent is 20, and we are also told that the Part of the marbles is red, so we know that the Part is 800.

So, that means that it must be the Total that's missing. Here is the way to figure out what the Total is:

Part/Total = Percent/100

By using a simple algebra we can re-arrange our Percent equation like this:

Part × 100/Percent = Total

If we take the "Part" and multiply it by 100, and then we divide that by the "Percent", we will get the "Total".

Let's try it out on our problem about the marbles, that's very simple and it's just two steps! We know that the "Part" (red marbles) is 800.

So step one is to just multiply that Part by 100.

800 × 100 = 80000

In step two, we take that 80000 and divide it by the "Percent", which we are told is 20.

So, 80000 divided by 20 = 4000

And that means that the total number of marbles is 4000.

Question: A high school marching band has 800 flute players, If 20 percent of the band members play the flute, then how many members are in the band?

Answer: There are 4000 members in the band.

How To: The smaller "Part" in this problem is 800 since there are 800 flute players and we are told that they make up 20 percent of the band, so the "Percent" is 20.

Again, it's the "Total" that's missing here, and to find it, we just need to follow our 2 step procedure as the previous problem.

For step one, we multiply the "Part" by 100.

800 × 100 = 80000

For step two, we divide that 80000 by the "Percent", which is 20.

80000 divided by 20 equals 4000

That means that the total number of band members is 4000.

## Another step by step method

Step 1: Let's assume the unknown value is Y

Step 2: First writing it as: 100% / Y = 20% / 800

Step 3: Drop the percentage marks to simplify your calculations: 100 / Y = 20 / 800

Step 4: Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 20 / 800 ) Y

Step 5: Simplifying the right side, we get: 100 = 20 Y

Step 6: Dividing both sides of the equation by 20, we will arrive at 4000 = Y

This leaves us with our final answer: 800 is 20 percent of 4000