# Find Three Consecutive Integers Whose Sum is 57 by 3 Ways

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The sum of three consecutive integers is 57, what are these integers? I can easily tell you that the answer are 18, 19 and 20. You must be interested in how to find these 3 consecutive integers whose sum is 57. There are three methods here, let us introduce them one by one below.

## How to find three consecutive integers whose sum is 57?

### 1. Hypothetical method

Assuming that N is used to represent the first integer, so the second integer is N + 1, the third integer is N + 2.

Therefore, the sum of 3 consecutive integers is 57, which can be expressed by the equation

N + (N + 1) + (N + 2) = 57

Solve this equation

N + (N + 1) + (N + 2) = 57

N + N + 1 + N + 2 = 57

3 * N + 1 + 2 = 57

3 * N + 3 = 57

3 * N = 57 – 3

3 * N = 54

N = 54 / 3

N = 18

Now, we can get that 18 is the first integer of 3 consecutive integers whose sum is 57. So, the second integer is 19, the third integer is 20.

The answer came out, the sum of 3 consecutive integers is 57, these three integers are 18, 19 and 20.

Verify: 18 + 19 + 20 = 57. Correct!

This is the most common method, let’s look at the second method, which is my favorite method.

### 2. Formula method

According to the consecutive integers calculator based on sum, we can know that the sum of M consecutive integers is S, the first integer formula is

First(n) = S / M – (M – 1) / 2

M represents the number of consecutive integers.

S stands for sum.

Back to the problem we want to solve: find three consecutive integers whose sum is 57. In here, M = 3, S = 57. Replace them in the formula to calculate the first integer

First(n) = 57 / 3 – (3 – 1) / 2 = 19 – (3 – 1) / 2 = 19 – 1 = 18

The first integer is 18, so, it can be easily calculated that the second integer is 19, the third integer is 20.

Thus, the answer are also 18, 19 and 20. Same as the first method. Then look at the third method, which is the simplest one.

### 3. Average method

The principle is very simple, because we want to calculate the consecutive integers, so after calculating the average, we can find the integers near the average.

The sum of 3 consecutive integers is 57, so, the average of these 3 consecutive integers is 57 / 3 = 19. The integers around 19 are 17, 18, 19, 20, 21. Now the problem is simple, find 3 consecutive integers from 17 to 21 and their average is 19. The answer are 18, 19 and 20.

So the sum of 3 consecutive integers is 57, these integers are 18, 19, 20. The results are consistent with the above two methods. Is it very simple?

## Problems can be sloved by this answer

Now, we have found out these 3 consecutive integers whose sum is 57, some problems can be easily solved.

• 1. What are three consecutive integers whose sum is 57?
The answer are 18, 19 and 20.
• 2. What is the smallest of three consecutive integers whose sum is 57?
• 3. What is the middle of three consecutive integers whose sum is 57?
• 4. What is the greatest of three consecutive integers whose sum is 57?
• 5. What is the average of three consecutive integers whose sum is 57?
The answer is  (18 + 19 + 20) / 3 = 57 / 3 = 19.
• 6. What is the product of three consecutive integers whose sum is 57?
The answer is 18 * 19 * 20 = 6840.
• 7. What is the sum of square of three consecutive integers whose sum is 57?
The answer is 182 + 192 + 202 = 1085.

## Summarize

On this page, In addition to introducing three methods how to find three consecutive integers whose sum is 57, it also provides a calculator that calculates three consecutive integers based on the sum. If you encounter a similar problem next time, you can directly use this calculator to calculate the answer, which is very convenient.

Of course, if the problem you encounter is more complicated, such as: the number of consecutive integers is not 3, or you need to calculate consecutive odd integers or even integers. You can use our other more advanced sum-based consecutive integers calculator, where you can specify the number of consecutive integers and select consecutive integers type: natural integers, odd integers or even integers. I believe it can help you.

Well, that’s it, the above are three solutions to find three consecutive integers whose sum is 57. It’s not very complicated, but I personally like the second method best, because it can accurately calculate the first integer and the calculation process is very simple. So how about you? Please leave a message and tell me which method you like?