Posted by Abby on .
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.

Algebra Its Urgent! 
Graham,
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.