I have followed the ASTM method to study the naphthalene content samples. As per the procedure I have taken 1g of fuel samples in 25 ml volumetric flask and volume makeup with iso octane. In 2nd dilution I took 5ml of samples and volume makeup with isooctane in 50ml volumetric flask. In 3rd dilution I took 5ml of 2nd stock solution in 50ml of volumetric flask and volume makeup with isooctane. What is the 1st,2nd, and 3rd dilution factor?