The sum of three consecutive odd integers is -51, how do you find the numbers?

2 Answers
Mar 14, 2018

-19, -17, -15

Explanation:

What I like to do with these problems is take the number and divide by the number of values we're looking fr, int his case, 3

so -51/3 = -17

Now we find two values that are equally distant from -17. They need to be odd numbers and consecutive. The two that follow that pattern are -19 and -15

Let's see if this works:

-19 + -17 + -15 = -51

We were right!

Mar 14, 2018

See a solution process below:

Explanation:

First, let's call the smallest number: n

Then, the next two consecutive odd numbers would be:

n + 2 and n + 4

We know the sum of these is -51 so we can write this equation and solve for n:

n + (n + 2) + (n + 4) = -51

n + n + 2 + n + 4 = -51

n + n + n + 2 + 4 = -51

1n + 1n + 1n + 2 + 4 = -51

(1 + 1 + 1)n + (2 + 4) = -51

3n + 6 = -51

3n + 6 - color(red)(6) = -51 - color(red)(6)

3n + 0 = -57

3n = -57

(3n)/color(red)(3) = -57/color(red)(3)

(color(red)(cancel(color(black)(3)))n)/cancel(color(red)(3)) = -19

n = -19

Therefore:

  • n + 2 = -19 + 2 = -17

  • n + 4 = -19 + 4 = -15

The three consecutive odd integers would be: -19, -17 and -15

-19 + -17 + -15 => -19 - 17 - 15 => -36 - 15 => -51