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?

Question

Quizplus · Accepted Answer

1 troy ounce = 20 pennyweights
1 pennyweight = 24 grains
1 grain ≈ 65 mg

So,

1 troy ounce ≈ 20 x 24 x 65 mg
1 troy ounce ≈ 31,104 mg
1000 troy ounces ≈ 31,104,000 mg
1000 troy ounces = 31.2 kg (rounded to one decimal place)

One Troy Ounce Is 20 Pennyweights, One Pennyweight Is 24