Confusing chemistry question. Help would be great!?

Question

A) What is the mass of Au in a 15.0 g earring if it is made of 14 karat gold? 14 karat gold is 58% gold, the remainder being copper and silver. B) Pewter, which is used to make utensils and decorative items is a mixture of the metals tin, copper, bismuth, and antimony. If a 1.256 g piece of pewter is found to contain 1.068 g of tin, what is the percentage of tin in the sample? C) You weighed 165 pounds and went on a diet, what percentage of your original weight did you lose?

Please help!!

Answer 1

A.  15 g x .58 = 8.7g of gold

B.  1.068g is X% of 1.256; divide both sides by 1.256

1.068/1,256 = 85.03%

C.  More information is needed..  In order to find the percentage, you need to know how much was lost.

Answer 2

A)

0.58 = x / 15g

x = 0.58 * 15

x = 8.7g

B)

% = 100 * 1.068 / 1.256

% = 85%

C)

Not enough information given. We would need to know either how many pounds we lost or what our current weight is in order to calculate the %.