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We already have our first value 120 and the second value 30. 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 1120 = 30% × Y
STEP 2120 = 30/100× Y
STEP 3Y = 120 × 100/30
STEP 4Y = 120 × 100 ÷ 30
STEP 5Y = 400
Finally, we have found the value of Y which is 400 and that is our answer.
You can easily calculate 120 is 30 percent of what number by using any regular calculator, simply enter 120 × 100 ÷ 30 and you will get your answer which is 400
Here is a Percentage Calculator to solve similar calculations such as 120 is 30 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.
Question: Your friend has a bag of marbles, and he tells you that 30 percent of the marbles are red. If there are 120 red marbles. How many marbles does he have altogether?
Answer: 400 marbles.
How To: In this problem, we know that the Percent is 30, and we are also told that the Part of the marbles is red, so we know that the Part is 120.
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 120.
So step one is to just multiply that Part by 100.
120 × 100 = 12000
In step two, we take that 12000 and divide it by the "Percent", which we are told is 30.
So, 12000 divided by 30 = 400
And that means that the total number of marbles is 400.
Question: A high school marching band has 120 flute players, If 30 percent of the band members play the flute, then how many members are in the band?
Answer: There are 400 members in the band.
How To: The smaller "Part" in this problem is 120 since there are 120 flute players and we are told that they make up 30 percent of the band, so the "Percent" is 30.
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.
120 × 100 = 12000
For step two, we divide that 12000 by the "Percent", which is 30.
12000 divided by 30 equals 400
That means that the total number of band members is 400.
Step 1: Let's assume the unknown value is Y
Step 2: First writing it as: 100% / Y = 30% / 120
Step 3: Drop the percentage marks to simplify your calculations: 100 / Y = 30 / 120
Step 4: Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 30 / 120 ) Y
Step 5: Simplifying the right side, we get: 100 = 30 Y
Step 6: Dividing both sides of the equation by 30, we will arrive at 400 = Y
This leaves us with our final answer: 120 is 30 percent of 400