Maddie, since it seems like the second number is the smallest, let's call it s.
If the third is three times the second, then it's 3s.
If the first is five more than the second, then it's s+ 5.
The sum is 90...
s + 5 + s + 3s = 90
s + s + 3s = 5 s, so...
5s + 5 = 90
We are solving for s, so the next step is to subtract 5 from both sides...
5s + 5 - 5 = 90 - 5
5s = 85
Now, we divide by 5...
5s/5 = 85/5
s = 17
If the 2nd number is 17, then the third is 3(17) = 51 and the first is 17 + 5 = 22.
Does 22 + 17 + 51 = 90? Sure does!
