Question

The Star of Africa, a diamond in the royal scepter of the British crown jewels, has a mass of 530.2 carats, where 1 carat = 0.20 g. Given that 1 kg has an approximate weight of 2.21 lb, what is the weight of this diamond in pounds.

Answer 1

What you can do is find the equivalence of 530.2carats in g using 1carat=0.20g. Remember that 1kg=1000g so you use it and 1kg=2.21lb to find it in pounds. The answer should be  2.343484 lb.
I hope this help greatly