Ruby worked X + 8
Isaac worked X
Svetlana worked 3(X+8)
Let's combine all of that by putting it in an equation
X+8+x+3(x+8)=150
Do what's in parentheses first
x+8+x+3x+24=150
Now we add likes
X+x+3x+8+24=150
5x+32=150
We want x on one side of the equation & numbers on the other side
5x+32-32=150-32
5x=118
Solving for X
5x/5=118/5
X=23.6
Isaac worked 23.6
Ruby worked 8 more hours than Isaac so we add 8 to 23.6= 31.6
Svetlana worked 3 times Ruby so 3x31.6= 94.8
