A coin contains 999 grams of nickel and 161616 grams of copper, for a total weight of 252525 grams.

X=64%

Step-by-step explanation:

The percentage of Cooper in the coin is 64%

How do you come to this conclusion?

252525--100%

161616--X%

Now you can use the cross rule: X=(161616x100)/252525

Check it out now X=64%

answer: what in the world is this

step-by-step explanation:

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2