Table gives the installed electricity capacity (gigawatts) from solar, wind and coal, plus population (millions), for states X and Y in 2011 and 2021.
| State | Year | Solar | Wind | Coal | Population (million) |
|---|---|---|---|---|---|
| X | 2011 | 20 | 10 | 40 | 50 |
| X | 2021 | 28 | 15 | 42 | 60 |
| Y | 2011 | 15 | 8 | 50 | 60 |
| Y | 2021 | 20 | 10 | 55 | 68 |
What is the average of the increase in the total installed capacity of electricity through renewable energy sources in the two states from 2011 to 2021?
A10 GW ✓ Correct
B12.5 GW
C17.7 GW
D22.5 GW
Correct answer: (A) 10 GW
Explanation
The average increase is 10 gigawatts, so the answer is 10 gigawatts.
In State X renewable rose from 30 to 43, an increase of 13 gigawatts.
In State Y renewable rose from 23 to 30, an increase of 7 gigawatts.
So the two increases are 13 and 7 gigawatts.
Their average is 13 plus 7, divided by 2.
That is 20 over 2, which is 10 gigawatts.
So the answer is 10 gigawatts.
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