Weighted sumhardFree question
Weighted sum Numerical Reasoning Question
CO₂ emissions by transport mode
| Mode | kg CO₂ per mile |
|---|---|
| Car | 0.54 |
| Train | 0.14 |
Using the chart, how much CO2 from a 3.6-mile car journey then a 15.0-mile train journey?
Show worked solution
Multiply each leg's quantity by its own rate, then add the products. The correct answer is 4.04 kg. Traps to avoid: 2.1 kg comes from the "train leg only" error; 0.68 kg comes from the "added the rates" error; 10.04 kg comes from the "same rate both" error; 1.94 kg comes from the "car leg only" error.
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