Question: 21 is 75 percent of what number

Answer: 21 is 75 percent of 28

Step by step solution for calculating 21 is 75 percent of what number

We already have our first value 21 and the second value 75. 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 21 = 75% × Y

STEP 2 21 = 75/100× Y

Multiplying both sides by 100 and dividing both sides of the equation by 75 we will arrive at:

STEP 3 Y = 21 × 100/75

STEP 4 Y = 21 × 100 ÷ 75

STEP 5 Y = 28

Finally, we have found the value of Y which is 28 and that is our answer.

You can easily calculate 21 is 75 percent of what number by using any regular calculator, simply enter 21 × 100 ÷ 75 and you will get your answer which is 28

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Sample questions, answers, and how to

Question: Your friend has a bag of marbles, and he tells you that 75 percent of the marbles are red. If there are 21 red marbles. How many marbles does he have altogether?

Answer: 28 marbles.

How To: In this problem, we know that the Percent is 75, and we are also told that the Part of the marbles is red, so we know that the Part is 21.

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 21.

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

21 × 100 = 2100

In step two, we take that 2100 and divide it by the "Percent", which we are told is 75.

So, 2100 divided by 75 = 28

And that means that the total number of marbles is 28.


Question: A high school marching band has 21 flute players, If 75 percent of the band members play the flute, then how many members are in the band?

Answer: There are 28 members in the band.

How To: The smaller "Part" in this problem is 21 since there are 21 flute players and we are told that they make up 75 percent of the band, so the "Percent" is 75.

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.

21 × 100 = 2100

For step two, we divide that 2100 by the "Percent", which is 75.

2100 divided by 75 equals 28

That means that the total number of band members is 28.

Have time and want to learn the calculation?

Let's assume the unknown value is Y

First writing it as: 100% / Y = 75% / 21

Drop the percentage marks to simplify your calculations: 100 / Y = 75 / 21

Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 75 / 21 ) Y

Simplifying the right side, we get: 100 = 75 Y

Dividing both sides of the equation by 75, we will arrive at 28 = Y

This leaves us with our final answer: 21 is 75 percent of 28

Percentage Table

21 is 75 percent of 28
21.01 is 75 percent of 28.013
21.02 is 75 percent of 28.027
21.03 is 75 percent of 28.04
21.04 is 75 percent of 28.053
21.05 is 75 percent of 28.067
21.06 is 75 percent of 28.08
21.07 is 75 percent of 28.093
21.08 is 75 percent of 28.107
21.09 is 75 percent of 28.12
21.1 is 75 percent of 28.133
21.11 is 75 percent of 28.147
21.12 is 75 percent of 28.16
21.13 is 75 percent of 28.173
21.14 is 75 percent of 28.187
21.15 is 75 percent of 28.2
21.16 is 75 percent of 28.213
21.17 is 75 percent of 28.227
21.18 is 75 percent of 28.24
21.19 is 75 percent of 28.253
21.2 is 75 percent of 28.267
21.21 is 75 percent of 28.28
21.22 is 75 percent of 28.293
21.23 is 75 percent of 28.307
21.24 is 75 percent of 28.32
21.25 is 75 percent of 28.333
21.26 is 75 percent of 28.347
21.27 is 75 percent of 28.36
21.28 is 75 percent of 28.373
21.29 is 75 percent of 28.387
21.3 is 75 percent of 28.4
21.31 is 75 percent of 28.413
21.32 is 75 percent of 28.427
21.33 is 75 percent of 28.44
21.34 is 75 percent of 28.453
21.35 is 75 percent of 28.467
21.36 is 75 percent of 28.48
21.37 is 75 percent of 28.493
21.38 is 75 percent of 28.507
21.39 is 75 percent of 28.52
21.4 is 75 percent of 28.533
21.41 is 75 percent of 28.547
21.42 is 75 percent of 28.56
21.43 is 75 percent of 28.573
21.44 is 75 percent of 28.587
21.45 is 75 percent of 28.6
21.46 is 75 percent of 28.613
21.47 is 75 percent of 28.627
21.48 is 75 percent of 28.64
21.49 is 75 percent of 28.653
21.5 is 75 percent of 28.667
21.51 is 75 percent of 28.68
21.52 is 75 percent of 28.693
21.53 is 75 percent of 28.707
21.54 is 75 percent of 28.72
21.55 is 75 percent of 28.733
21.56 is 75 percent of 28.747
21.57 is 75 percent of 28.76
21.58 is 75 percent of 28.773
21.59 is 75 percent of 28.787
21.6 is 75 percent of 28.8
21.61 is 75 percent of 28.813
21.62 is 75 percent of 28.827
21.63 is 75 percent of 28.84
21.64 is 75 percent of 28.853
21.65 is 75 percent of 28.867
21.66 is 75 percent of 28.88
21.67 is 75 percent of 28.893
21.68 is 75 percent of 28.907
21.69 is 75 percent of 28.92
21.7 is 75 percent of 28.933
21.71 is 75 percent of 28.947
21.72 is 75 percent of 28.96
21.73 is 75 percent of 28.973
21.74 is 75 percent of 28.987
21.75 is 75 percent of 29
21.76 is 75 percent of 29.013
21.77 is 75 percent of 29.027
21.78 is 75 percent of 29.04
21.79 is 75 percent of 29.053
21.8 is 75 percent of 29.067
21.81 is 75 percent of 29.08
21.82 is 75 percent of 29.093
21.83 is 75 percent of 29.107
21.84 is 75 percent of 29.12
21.85 is 75 percent of 29.133
21.86 is 75 percent of 29.147
21.87 is 75 percent of 29.16
21.88 is 75 percent of 29.173
21.89 is 75 percent of 29.187
21.9 is 75 percent of 29.2
21.91 is 75 percent of 29.213
21.92 is 75 percent of 29.227
21.93 is 75 percent of 29.24
21.94 is 75 percent of 29.253
21.95 is 75 percent of 29.267
21.96 is 75 percent of 29.28
21.97 is 75 percent of 29.293
21.98 is 75 percent of 29.307
21.99 is 75 percent of 29.32