21) E

1: Correct
The answer lies in the last sentence of the ‘Chemicals Used’ paragraph. Fracking fluids consist of 99.2% water and 0.8% chemicals.

From the table, volume water used in Texas from 2005-12 = 110,000 million gallons

Let volume of fracking fluid used = F

99.2% (≈ 99%) of F = 110,000
0.99 x F = 110,000
F = 110,000 ÷ 0.99
0.8% of (110,000 ÷ 0.99) ≈ 880

The figure is in fact 880 million (we did not use million in our calculation). So Statement 1 is correct.

2: Wrong
The text mentions that the volume of pollution produced by completion of fracking wells = volume of pollution produced by 28 coal stations.

Volume of pollution produced by completion of fracking wells = 100, 551, 000
So, volume of pollution produced by 28 (≈ 30) coal stations = 100, 551, 000

Volume of pollution produced by 1 coal station = (100,551,000 ÷ 30) ≈ 3,351,700
This is not equal to 36,000,000 of CO₂

3: Correct
In the paragraph ‘Water used’, it is stated that the water was enough to meet the demands of 200,000 households.
According to the table, volume of water used in Colorado = 26,000million

Volume used per household = (26,000,000,000 ÷ 200,000) = 130,000 gallons

Statements 1 and 3 are correct. So E is the answer.

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