Question: 18 is 90 percent of what number

Answer: 18 is 90 percent of 20

Step by step solution for calculating 18 is 90 percent of what number

We already have our first value 18 and the second value 90. 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 = 90% × Y

STEP 2 18 = 90/100× Y

Multiplying both sides by 100 and dividing both sides of the equation by 90 we will arrive at:

STEP 3 Y = 18 × 100/90

STEP 4 Y = 18 × 100 ÷ 90

STEP 5 Y = 20

Finally, we have found the value of Y which is 20 and that is our answer.

You can easily calculate 18 is 90 percent of what number by using any regular calculator, simply enter 18 × 100 ÷ 90 and you will get your answer which is 20

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Sample questions, answers, and how to

Question: Your friend has a bag of marbles, and he tells you that 90 percent of the marbles are red. If there are 18 red marbles. How many marbles does he have altogether?

Answer: 20 marbles.

How To: In this problem, we know that the Percent is 90, and we are also told that the Part of the marbles is red, so we know that the Part is 18.

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.

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

18 × 100 = 1800

In step two, we take that 1800 and divide it by the "Percent", which we are told is 90.

So, 1800 divided by 90 = 20

And that means that the total number of marbles is 20.


Question: A high school marching band has 18 flute players, If 90 percent of the band members play the flute, then how many members are in the band?

Answer: There are 20 members in the band.

How To: The smaller "Part" in this problem is 18 since there are 18 flute players and we are told that they make up 90 percent of the band, so the "Percent" is 90.

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 × 100 = 1800

For step two, we divide that 1800 by the "Percent", which is 90.

1800 divided by 90 equals 20

That means that the total number of band members is 20.

Have time and want to learn the calculation?

Let's assume the unknown value is Y

First writing it as: 100% / Y = 90% / 18

Drop the percentage marks to simplify your calculations: 100 / Y = 90 / 18

Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 90 / 18 ) Y

Simplifying the right side, we get: 100 = 90 Y

Dividing both sides of the equation by 90, we will arrive at 20 = Y

This leaves us with our final answer: 18 is 90 percent of 20

Percentage Table

18 is 90 percent of 20
18.01 is 90 percent of 20.011
18.02 is 90 percent of 20.022
18.03 is 90 percent of 20.033
18.04 is 90 percent of 20.044
18.05 is 90 percent of 20.056
18.06 is 90 percent of 20.067
18.07 is 90 percent of 20.078
18.08 is 90 percent of 20.089
18.09 is 90 percent of 20.1
18.1 is 90 percent of 20.111
18.11 is 90 percent of 20.122
18.12 is 90 percent of 20.133
18.13 is 90 percent of 20.144
18.14 is 90 percent of 20.156
18.15 is 90 percent of 20.167
18.16 is 90 percent of 20.178
18.17 is 90 percent of 20.189
18.18 is 90 percent of 20.2
18.19 is 90 percent of 20.211
18.2 is 90 percent of 20.222
18.21 is 90 percent of 20.233
18.22 is 90 percent of 20.244
18.23 is 90 percent of 20.256
18.24 is 90 percent of 20.267
18.25 is 90 percent of 20.278
18.26 is 90 percent of 20.289
18.27 is 90 percent of 20.3
18.28 is 90 percent of 20.311
18.29 is 90 percent of 20.322
18.3 is 90 percent of 20.333
18.31 is 90 percent of 20.344
18.32 is 90 percent of 20.356
18.33 is 90 percent of 20.367
18.34 is 90 percent of 20.378
18.35 is 90 percent of 20.389
18.36 is 90 percent of 20.4
18.37 is 90 percent of 20.411
18.38 is 90 percent of 20.422
18.39 is 90 percent of 20.433
18.4 is 90 percent of 20.444
18.41 is 90 percent of 20.456
18.42 is 90 percent of 20.467
18.43 is 90 percent of 20.478
18.44 is 90 percent of 20.489
18.45 is 90 percent of 20.5
18.46 is 90 percent of 20.511
18.47 is 90 percent of 20.522
18.48 is 90 percent of 20.533
18.49 is 90 percent of 20.544
18.5 is 90 percent of 20.556
18.51 is 90 percent of 20.567
18.52 is 90 percent of 20.578
18.53 is 90 percent of 20.589
18.54 is 90 percent of 20.6
18.55 is 90 percent of 20.611
18.56 is 90 percent of 20.622
18.57 is 90 percent of 20.633
18.58 is 90 percent of 20.644
18.59 is 90 percent of 20.656
18.6 is 90 percent of 20.667
18.61 is 90 percent of 20.678
18.62 is 90 percent of 20.689
18.63 is 90 percent of 20.7
18.64 is 90 percent of 20.711
18.65 is 90 percent of 20.722
18.66 is 90 percent of 20.733
18.67 is 90 percent of 20.744
18.68 is 90 percent of 20.756
18.69 is 90 percent of 20.767
18.7 is 90 percent of 20.778
18.71 is 90 percent of 20.789
18.72 is 90 percent of 20.8
18.73 is 90 percent of 20.811
18.74 is 90 percent of 20.822
18.75 is 90 percent of 20.833
18.76 is 90 percent of 20.844
18.77 is 90 percent of 20.856
18.78 is 90 percent of 20.867
18.79 is 90 percent of 20.878
18.8 is 90 percent of 20.889
18.81 is 90 percent of 20.9
18.82 is 90 percent of 20.911
18.83 is 90 percent of 20.922
18.84 is 90 percent of 20.933
18.85 is 90 percent of 20.944
18.86 is 90 percent of 20.956
18.87 is 90 percent of 20.967
18.88 is 90 percent of 20.978
18.89 is 90 percent of 20.989
18.9 is 90 percent of 21
18.91 is 90 percent of 21.011
18.92 is 90 percent of 21.022
18.93 is 90 percent of 21.033
18.94 is 90 percent of 21.044
18.95 is 90 percent of 21.056
18.96 is 90 percent of 21.067
18.97 is 90 percent of 21.078
18.98 is 90 percent of 21.089
18.99 is 90 percent of 21.1