Anna has $15 more than Lala does. If I gave Lala $60, she will have three times as much as Anna.
Find how much Lala has at the first place?
Before the giving:
Lala has x
Anna has x+15
After the giving:
Lala has x+60
Anna has x+15
x+60 = 3(x+15)
solve for x, sub into my definitions