An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 90 grams of an alloy containing 15% copper with 70 grams of an alloy containing 35% copper. Answer the questions below. Do not do any rounding. How many grams of copper are in the resulting mixture?
What percentage of the resulting mixture is copper?

9 x 8 divided by (5-3)=36

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!

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