# Question: 18.9 is 21 percent of what number

## Step by step solution for calculating 18.9 is 21 percent of what number

We already have our first value 18.9 and the second value 21. 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 18.9 = 21% × Y

STEP 2 18.9 = 21/100× Y

Multiplying both sides by 100 and dividing both sides of the equation by 21 we will arrive at:

STEP 3 Y = 18.9 × 100/21

STEP 4 Y = 18.9 × 100 ÷ 21

STEP 5 Y = 90

Finally, we have found the value of Y which is 90 and that is our answer.

You can easily calculate 18.9 is 21 percent of what number by using any regular calculator, simply enter 18.9 × 100 ÷ 21 and you will get your answer which is 90

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## Sample questions, answers, and how to

Question: Your friend has a bag of marbles, and he tells you that 21 percent of the marbles are red. If there are 18.9 red marbles. How many marbles does he have altogether?

How To: In this problem, we know that the Percent is 21, and we are also told that the Part of the marbles is red, so we know that the Part is 18.9.

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 18.9.

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

18.9 × 100 = 1890

In step two, we take that 1890 and divide it by the "Percent", which we are told is 21.

So, 1890 divided by 21 = 90

And that means that the total number of marbles is 90.

Question: A high school marching band has 18.9 flute players, If 21 percent of the band members play the flute, then how many members are in the band?

Answer: There are 90 members in the band.

How To: The smaller "Part" in this problem is 18.9 since there are 18.9 flute players and we are told that they make up 21 percent of the band, so the "Percent" is 21.

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.

18.9 × 100 = 1890

For step two, we divide that 1890 by the "Percent", which is 21.

1890 divided by 21 equals 90

That means that the total number of band members is 90.

## Have time and want to learn the calculation?

Let's assume the unknown value is Y

First writing it as: 100% / Y = 21% / 18.9

Drop the percentage marks to simplify your calculations: 100 / Y = 21 / 18.9

Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 21 / 18.9 ) Y

Simplifying the right side, we get: 100 = 21 Y

Dividing both sides of the equation by 21, we will arrive at 90 = Y

This leaves us with our final answer: 18.9 is 21 percent of 90

## Percentage Table

 18.9 is 21 percent of 90 18.91 is 21 percent of 90.048 18.92 is 21 percent of 90.095 18.93 is 21 percent of 90.143 18.94 is 21 percent of 90.19 18.95 is 21 percent of 90.238 18.96 is 21 percent of 90.286 18.97 is 21 percent of 90.333 18.98 is 21 percent of 90.381 18.99 is 21 percent of 90.429 19 is 21 percent of 90.476 19.01 is 21 percent of 90.524 19.02 is 21 percent of 90.571 19.03 is 21 percent of 90.619 19.04 is 21 percent of 90.667 19.05 is 21 percent of 90.714 19.06 is 21 percent of 90.762 19.07 is 21 percent of 90.81 19.08 is 21 percent of 90.857 19.09 is 21 percent of 90.905
 19.1 is 21 percent of 90.952 19.11 is 21 percent of 91 19.12 is 21 percent of 91.048 19.13 is 21 percent of 91.095 19.14 is 21 percent of 91.143 19.15 is 21 percent of 91.19 19.16 is 21 percent of 91.238 19.17 is 21 percent of 91.286 19.18 is 21 percent of 91.333 19.19 is 21 percent of 91.381 19.2 is 21 percent of 91.429 19.21 is 21 percent of 91.476 19.22 is 21 percent of 91.524 19.23 is 21 percent of 91.571 19.24 is 21 percent of 91.619 19.25 is 21 percent of 91.667 19.26 is 21 percent of 91.714 19.27 is 21 percent of 91.762 19.28 is 21 percent of 91.81 19.29 is 21 percent of 91.857
 19.3 is 21 percent of 91.905 19.31 is 21 percent of 91.952 19.32 is 21 percent of 92 19.33 is 21 percent of 92.048 19.34 is 21 percent of 92.095 19.35 is 21 percent of 92.143 19.36 is 21 percent of 92.19 19.37 is 21 percent of 92.238 19.38 is 21 percent of 92.286 19.39 is 21 percent of 92.333 19.4 is 21 percent of 92.381 19.41 is 21 percent of 92.429 19.42 is 21 percent of 92.476 19.43 is 21 percent of 92.524 19.44 is 21 percent of 92.571 19.45 is 21 percent of 92.619 19.46 is 21 percent of 92.667 19.47 is 21 percent of 92.714 19.48 is 21 percent of 92.762 19.49 is 21 percent of 92.81
 19.5 is 21 percent of 92.857 19.51 is 21 percent of 92.905 19.52 is 21 percent of 92.952 19.53 is 21 percent of 93 19.54 is 21 percent of 93.048 19.55 is 21 percent of 93.095 19.56 is 21 percent of 93.143 19.57 is 21 percent of 93.19 19.58 is 21 percent of 93.238 19.59 is 21 percent of 93.286 19.6 is 21 percent of 93.333 19.61 is 21 percent of 93.381 19.62 is 21 percent of 93.429 19.63 is 21 percent of 93.476 19.64 is 21 percent of 93.524 19.65 is 21 percent of 93.571 19.66 is 21 percent of 93.619 19.67 is 21 percent of 93.667 19.68 is 21 percent of 93.714 19.69 is 21 percent of 93.762
 19.7 is 21 percent of 93.81 19.71 is 21 percent of 93.857 19.72 is 21 percent of 93.905 19.73 is 21 percent of 93.952 19.74 is 21 percent of 94 19.75 is 21 percent of 94.048 19.76 is 21 percent of 94.095 19.77 is 21 percent of 94.143 19.78 is 21 percent of 94.19 19.79 is 21 percent of 94.238 19.8 is 21 percent of 94.286 19.81 is 21 percent of 94.333 19.82 is 21 percent of 94.381 19.83 is 21 percent of 94.429 19.84 is 21 percent of 94.476 19.85 is 21 percent of 94.524 19.86 is 21 percent of 94.571 19.87 is 21 percent of 94.619 19.88 is 21 percent of 94.667 19.89 is 21 percent of 94.714