What was the total amount of fuel used in 2020?
A town reports the fuel used (in gigawatt-hours) by its district heating plant in two years. The table lists each fuel.
Fuel | 2015 | 2020
Biomass | 120 | 150
Waste heat | 40 | 70
Oil | 60 | 20
Electricity | 30 | 40
Fuel | 2015 | 2020
Biomass | 120 | 150
Waste heat | 40 | 70
Oil | 60 | 20
Electricity | 30 | 40
Answer and explanation
Correct answer: B. 280 gigawatt-hours
- Step 1: Add the 2020 column: . Step 2. , , . Answer: 280. Why not the others: 250 is the 2015 total, and the others are slips.
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