For

and

to be inversely proportional, there must be some constant

such that

Given that

when

, it follows that

Then when

, we have
So,
To find the percentage that the copper comprises, just divide the amount of copper by the total amount of metal in the coin. In this case, we will change the denominator so that it is 100, which can easily be converted into a percentage, which is really just a fraction out of 100.

75%
75% of the metal in the coin is copper.
Answer:
1/6
Step-by-step explanation:
sim[le thought
Rhombus -> 2 equivalent obtuse angles, 2 equivalent acute angles
vs.
Rectangle -> 4 equivalent right angles.