An ore contains 40% of mass as impurity, while the
metal extracted from this ore contains 4% impurity.
How much metal will 24 tones of the ore yield?
(a) 12 tonnes
(b) 13 tonnes
(c) 14 tonnes
(d) 15 tonnes
Answers
Answer:
15
Step-by-step explanation:
60% of ore = 96% of pure metal
60/100*24 = 96/100*Metal
Metal = 60*24/96
=15
An ore is a deposit of one or more valuable minerals in the earth's crust. The most valuable ore deposits contain metals key to industry and commerce, such as copper, gold, and iron.
Copper ore is mined for various industrial purposes. Copper, an excellent conductor of electricity, is used as the electrical wire. Copper is also used in construction. It is a common material in piping and plumbing.
Like copper, gold is mined for the industry. For example, space helmets are coated with a thin layer of gold to protect astronauts' eyes from harmful sunlight. However, most gold is used to make jewelry. For thousands of years, gold ore has been mined as the basis of currency, or money. Steel is a strong and valuable building material. Iron is used in everything from glass to fertilizer to the solid-fuel rocket boosters once used for space shuttles to leave Earth's atmosphere.
60% of ore = 96% of pure metal
Metal =
=15
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