Solved: What is 15 Percent of 21? = 3.15 | 15% of 21 = 3.15

Percentage Calculator: 15 Percent of 21

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Calculation of What is 15 percent of 21:

15 percent * 21 =

(15 / 100) * 21 =

(15 * 21) / 100 =

315 / 100 =

3.15

Now we have the answer: 15% of 21 = 3.15. Alternatively, we can express it as: 3.15 is equivalent to 15 percent of 21.

Mathematical Notation: 15% * 21 = (15 / 100) * 21 = (15 * 21) / 100 = 315 / 100 = 3.15

Formula we can use to solve our problem:

Formula: X/100 × Y

Let's use the example of "What is 15% of 21?" to understand the calculation:

= 15/100 × 21 = 3.15

Check our "What is X Percent of Y" Calculator for more methods and formulas

Solution for "What is 15 percent of 21" with Step-by-step guide:

Step 1: Start with the given output value, which is 3.15.

Step 2: Use the variable 'x' to represent the unknown value.

Step 3: From Step 1, we know that 3.15 is equivalent to 100%.

Step 4: Similarly, we can determine that 'x' represents 15% of the value.

Step 5: This leads us to two simple equations:

Equation 1: 21 equals 100%
Equation 2: 'x' equals 15%

Step 6: To solve for 'x', we divide equation 1 by equation 2, considering that both equations have the same unit (%). Thus, we obtain:
21 / x = 100% / 15%

Step 7: By taking the reciprocal of both sides of the equation obtained in Step 6, we have:
x / 21 = 15 / 100
⇒ x = 3.15

Therefore, we conclude that 15% of 21 is equal to 3.15.

I hope explanation above helps you understand how to calculate 15 percent of 21

Written by: Dr. Mohammad Monir Uddin

Associate Professor, Ph.D. (in Mathematics), M.Sc. (in Applied Mathematics)

Quick Tip - How Calculate 15 percent of 21 on calculator

If you want to use a calculator to know what is 15 percent of 21, simply enter 15 ÷ 100 × 21 and you will get your answer which is 3.15

Frequently Asked Questions on What is 15 percent of 21

1. How do I calculate percentage of a total?

To calculate percentages of a total: determine the part, divide it by the total, and multiply by 100.

2. What is 15% of 21?

15 percent of 21 is 3.15.

3. How to calculate 15 percent of 21?

Multiply 15/100 by 21 = (15/100) * 21 = (15 * 21) / 100 = 3.15.

2. 15 of 21?

15 of 21 = 3.15.

4. what is 15 percent of 21 dollars?

3.15 dollars.

Sample questions and answers

Question: At a high school 15 percent of seniors went on a mission trip. There were 21 seniors. How many seniors went on the trip?

Answer: 3.15 seniors went on the trip.

Question: 15 percent of the children in kindergarten like Thomas the Train. If there are 21 kids in kindergarten, how many of them like Thomas?

Answer: 3.15 kids like Thomas the Train.

What is 15 percent of 21? (15% of 21?)

Answer: 15 percent of 21 is 3.15. Alternatively, we can say that 3.15 is equivalent to 15% of 21.