Algebra Its Urgent!
posted by Abby .
A second number is three times a first number. A third number is 15 more than the first number. If the sum of the three numbers is 330, find the numbers.

Let the numbers be a, b, c
b = 3a
c = 15+a
a+b+c=330
Substitute for b and c in and solve the sum for a.
Use a to determine b and c.