Question: 280 is 8 percent of what number?

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Question: Your friend has a bag of marbles, and he tells you that 8 percent of the marbles are red. If there are 280 red marbles. How many marbles does he have altogether?

Answer: 3500 marbles.

How To: In this problem, we know that the Percent is 8, and we are also told that the Part of the marbles is red, so we know that the Part is 280.

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 280.

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

280 × 100 = 28000

In step two, we take that 28000 and divide it by the "Percent", which we are told is 8.

So, 28000 divided by 8 = 3500

And that means that the total number of marbles is 3500.

Question: A high school marching band has 280 flute players, If 8 percent of the band members play the flute, then how many members are in the band?

Answer: There are 3500 members in the band.

How To: The smaller "Part" in this problem is 280 since there are 280 flute players and we are told that they make up 8 percent of the band, so the "Percent" is 8.

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.

280 × 100 = 28000

For step two, we divide that 28000 by the "Percent", which is 8.

28000 divided by 8 equals 3500

That means that the total number of band members is 3500.

Another step by step method

Step 1: Let's assume the unknown value is Y

Step 2: First writing it as: 100% / Y = 8% / 280

Step 3: Drop the percentage marks to simplify your calculations: 100 / Y = 8 / 280

Step 4: Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 8 / 280 ) Y

Step 5: Simplifying the right side, we get: 100 = 8 Y

Step 6: Dividing both sides of the equation by 8, we will arrive at 3500 = Y

This leaves us with our final answer: 280 is 8 percent of 3500

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