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Uranium is present in seawater at a concentration of 3 parts per billi

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Uranium is present in seawater at a concentration of 3 parts per billi [#permalink] New post   06 Apr 2022, 02:30
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Uranium is present in seawater at a concentration of 3 parts per billion. If a process is available to extract this uranium, how many kilograms of seawater would need to be processed in order to obtain 50 kilograms of uranium?

Round your answer to two significant digits.

Indicate all that apply

17 million kilograms
150 million kilograms
17 billion kilograms
150 billion kilograms
17 trillion kilograms

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C
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B
volcanictempest78
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Re: Uranium is present in seawater at a concentration of 3 parts per billi [#permalink] New post   06 Apr 2022, 10:03
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1 percent means 1 in 100, similarly 1 part per billion (bn) means 1 in 1 bn
given 3 part in 1 bn, since everything is in kilogram, the question stem means 3 kg Ur was present in 1 bn kg of seawater,
50 kg will be in ...cal
3 1 bn
50 x bn
cross multiply 3x=50 x= 16.66666....round to 17
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Re: Uranium is present in seawater at a concentration of 3 parts per billi [#permalink] New post   06 Apr 2022, 12:00
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3 part per 1 B

50/3 part per 16.666 B

Option C is closest and correct choice
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Re: Uranium is present in seawater at a concentration of 3 parts per billi [#permalink] New post   26 Sep 2024, 05:58
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Re: Uranium is present in seawater at a concentration of 3 parts per billi [#permalink]
26 Sep 2024, 05:58
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