Question

I The average age of three brothers is
15 years. If the age of two brothers is 15years and 12 years , find the age of the Thursday one
​

Answer 1

Answer:

The third brother is 18 years old.

Step-by-step explanation:

When finding the average, you add up all the numbers and divide it by the number of numbers. To solve this problem, we will use the equation:

$\frac{x+y+z}{3}$= 15

For this problem, we will say that x=15 and y=12. Now we know that:

$\frac{15+12+z}{3}$ =15 or $\frac{27+z}{3}$=15

Next, we want to multiply each side by 3. When we do this, the new equation is:

27+z=45

Then, we will subtract 27 from both sides and find out that:

z=18

This means that the third brother is 18 years old.

To check if this answer is correct we can do:

(15+12+18)/3=15

and since it worked out to be correct, we know that our answer is correct!

*** If you notice any mistake in my work, feel free to leave a comment and I'll try to fix it, but I tried to double check to confirm that all my answers are correct. Also, if you agree with my answers, please rate it or give it a thanks or mark it as the brainliest answer!

Hope this helped

- Brooklyn