The question here is orders of magnitude. 1 gram = 1000 milligrams, and 1 milligram = 1000 micrograms and 1 microgram = 1000 nanograms, so 160 nanograms divided by 1000, divided by 1000 = the number of milligrams or 160 nanograms equals 0.00016 milligrams.
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180 milligrams of anything is the same as 180,000,000 nanograms of the same substance.
nano is 10 to the power of -9, micro is 10 to the power of -6 and so number of nano grams in i micro gram is 10 to the power of -6 divided by 10 to the power of -9, giving an answer of 1000
10
There are 25,400,000 nanometers in one inch.
6.9 nanoseconds = 6.9 × 10-9 seconds