Solve the Problem. -Anne and Nancy Use a Metal Alloy That Is 25.75

question 90

Multiple Choice

Solve the problem.
-Anne and Nancy use a metal alloy that is 25.75% copper to make jewelry. How many ounces of a 19% alloy must be mixed with a 28% alloy to form 92 ounces of the desired alloy?

• A)25 ounces
• B)23 ounces
• C)74 ounces
• D)69 ounces

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Definitions:

Island Arc

A curved chain of volcanic islands located at a tectonic plate boundary, formed by the subduction of an oceanic plate beneath another.

Gabbro

A coarse-grained igneous rock that forms from the slow cooling of magma beneath the Earth's surface, composed mainly of plagioclase feldspar and pyroxene.

Welded Rhyolite

Is a type of volcanic rock that has been superheated and compacted under extreme conditions, resulting in a dense, hard rock.

Calderas

Large, usually circular depressions in the ground caused by volcanic activity, specifically the collapse of a magma chamber after a volcanic eruption.