To get the solution, we are looking for, we need to point out what we know.
1. We assume, that the number 321 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 321 is 100%, so we can write it down as 321=100%. 4. We know, that x is 642% of the output value, so we can write it down as x=642%. 5. Now we have two simple equations: 1) 321=100% 2) x=642% 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: 321/x=100%/642% 6. Now we just have to solve the simple equation, and we will get the solution we are looking for.
7. Solution for what is 642% of 321
321/x=100/642 (321/x)*x=(100/642)*x -we multiply both sides of the equation by x 321=0.15576323987539*x - we divide both sides of the equation by (0.15576323987539) to get x 321/0.15576323987539=x 2060.82=x x=2060.82