One troy ounce is 20 pennyweights, one pennyweight is 24 grains, and one grain is approximately 65 milligrams.How much is 1000 troy ounces, in SI units?
A) $ 1000 g $
B) $ 1 \mathrm{~kg} $
C) $ 31.2 \mathrm{~kg} $
D) $ 31.2 \mathrm{~g} $
E) None of the above

Question

One troy ounce is 20 pennyweights, one pennyweight is 24 grains, and one grain is approximately 65 milligrams.How much is 1000 troy ounces, in SI units? 
A) $ 1000 g $
B) $ 1 \mathrm{~kg} $
C) $ 31.2 \mathrm{~kg} $
D) $ 31.2 \mathrm{~g} $
E) None of the above

Quizplus · Accepted Answer

To convert 1000 troy ounces to SI units, we first need to convert to pennyweights:
1000 oz x 20 dwt/oz = 20,000 dwt
Next, we need to convert to grains:
20,000 dwt x 24 gr/dwt = 480,000 gr
Finally, we can convert to grams:
480,000 gr x 0.065 g/gr = 31,200 g or 31.2 kg. 
Therefore, the answer is choice C, 31.2 kg.

One Troy Ounce Is 20 Pennyweights, One Pennyweight Is 24 1000g 1000 g 1000g

One Troy Ounce Is 20 Pennyweights, One Pennyweight Is 24 $1000 g$