We assume, that the number 600 is 100% - because it's the output value of the task. 2. We assume, that x is the value we are looking for. 3. If 600 is 100%, so we can write it down as 600=100%. 4. We know, that x is 55% of the output value, so we can write it down as x=55%. 5. Now we have two simple equations: 1) 600=100% 2) x=55% where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that: 600/x=100%/55% 6. Now we just have to solve the simple equation, and we will get the solution we are looking for.
