Write the equality and conversion factors, and identify the numbers as exact or give the number of significant figures for each of the following:
a. The highway gas mileage was 28 mi/gal.
b. There are 20 drops in 1 mL of water.
c. The nitrate level in well water was 32 ppm.
d. A DVD contains 17 GB of information.
e. One capsule of fish oil contains 360 mg of omega-3-fatty acids.
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