Describe how you can find the relative desities o 4 different liquids.

You can let one float on the others, if they are not miscible. The less dense will be on top of the heavier dense.
See experiment 2 on this site:

http://www.hometrainingtools.com/articles/liquid-density-project.html

I think this is a thought question designed to make you more aware of the procedures for determining the density of various materials. I don't want to simply give you the answer so please post what you think and someone will critique your answer. Hint: Think about using the weight lost when a material is weighed in air, then water. I hope this helps.

I got the answer my teacher explained it to me

157 cm = ---------- m
1.32 m = ---------- Km
92 Km = ---------- cm
28.2 m = ---------- mm
28'2 m = ---------- mm
0.554 m = ---------- Km

157 cm = 1.57 m (To convert from centimeters to meters, divide by 100 since there are 100 centimeters in a meter)

1.32 m = 0.00132 Km (To convert from meters to kilometers, divide by 1000 since there are 1000 meters in a kilometer)

92 Km = 9,200,000 cm (To convert from kilometers to centimeters, multiply by 100,000 since there are 100,000 centimeters in a kilometer)

28.2 m = 28,200 mm (To convert from meters to millimeters, multiply by 1000 since there are 1000 millimeters in a meter)

28'2 m - This seems to be a typo as the format does not match the previous conversions. Please provide the correct format or clarify the units.

0.554 m = 0.000554 Km (To convert from meters to kilometers, divide by 1000 since there are 1000 meters in a kilometer)