Step by action solution for calculating 18 is 20 percent of what number

We already have our an initial value 18 and the 2nd value 20. Let"s assume the unknown value is Y which answer us will uncover out.

You are watching: 18 is 20 percent of what number

As we have all the forced values we need, currently we have the right to put castle in a basic mathematical formula together below:

STEP 118 = 20% × Y

STEP 218 = 20/100× Y

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

STEP 3Y = 18 × 100/20

STEP 4Y = 18 × 100 ÷ 20

STEP 5Y = 90

Finally, we have found the value of Y i beg your pardon is 90 and also that is our answer.

You can easily calculate 18 is 20 percent that what number by using any type of regular calculator, simply get in 18 × 100 ÷ 20 and you will get your answer i beg your pardon is 90


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Sample questions, answers, and how to

Question: her friend has a bag that marbles, and also he speak you that 20 percent that the marbles space red. If there are 18 red marbles. How many marbles go he have actually altogether?

Answer: 90 marbles.

How To: In this problem, we recognize that the Percent is 20, and also we are additionally told the the part of the marbles is red, so we understand that the component is 18.

So, that way that it must be the complete that"s missing. Here is the means to figure out what the total is:

Part/Total = Percent/100

By utilizing a simple algebra we deserve to re-arrange our Percent equation like this:

Part × 100/Percent = Total

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

Let"s try it out on ours problem around the marbles, that"s very basic and it"s simply two steps! We understand that the "Part" (red marbles) is 18.

So action one is to simply multiply that part by 100.

18 × 100 = 1800

In action two, us take that 1800 and divide the by the "Percent", which we room told is 20.

So, 1800 split by 20 = 90

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

Question: A high school marching band has 18 flute players, If 20 percent that the tape members pat the flute, climate how countless members are in the band?

Answer: There room 90 members in the band.

How To: The smaller "Part" in this trouble is 18 because there room 18 flute players and we are told that they consist of 20 percent that the band, therefore the "Percent" is 20.

Again, it"s the "Total" that"s absent here, and to discover it, we just need to follow our 2 action procedure as the vault problem.

For action one, us multiply the "Part" by 100.

18 × 100 = 1800

For action two, we divide that 1800 by the "Percent", i m sorry is 20.

See more: Is Radio Masculine Or Feminine In Spanish, Is Radio A Masculine Or Feminine Word

1800 separated by 20 equals 90

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

Another step by action method

Step 1: Let"s i think the unknown worth is Y

Step 2: first writing the as: 100% / Y = 20% / 18

Step 3: drop the percent marks to leveling your calculations: 100 / Y = 20 / 18

Step 4: main point both sides by Y to move Y ~ above the right side of the equation: 100 = ( 20 / 18 ) Y

Step 5: simplifying the ideal side, us get: 100 = 20 Y

Step 6: dividing both sides of the equation by 20, we will arrive at 90 = Y

This leaves us with our last answer: 18 is 20 percent that 90


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