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
