Answer:
The third number (c) is 54.
The other ones are 70 and 56.
Explanation:
We have 3 numbers, let's call them a, b and c.
We know that the sum of the three numbers is 180, thus:

We also know that the first number is 10 more than the mean of the three numbers (Note: the mean is the sum of the numbers divided by the number of numbers). Thus:

Finally the second number is 4 less than the mean:

Now we have our set of equations and we can proceed to solve them:

Solving for a in our first equation we have:
and substituting this in our second equation we have:

Now taking this last result into our first equation we have:

Now we are going to solve for b in our second equation and substitute this in our third equation:


But we know that a =70, so we can substitute it in our last line:

Now we just need to find b and we can use our first original equation to do this:
