Question

If 7 giant solar power plants generate 1.3 gigawatts of energy to power 900,000 homes, how many gigawatts can 21 giant solar plants generate

Answer 1

Well... triple the numbers. 7x3 is 21. 1.3x3 is 3.9. And 900,000x3 is 2,700,000. But the answer is: 3.9gigawatts

Answer 2

Answer: 3.9 gigawatts

Explanation:

Using the idea of proportion;

If 7 giants = 1.3 gigawatts

21 giants = x gigawatts

We cross multiply

7 × X = 21 × 1.3

7X = 27.3

We divide bothside by 7 to get the value of x

7X/7 = 27.3/7

x = 3.9

Therefore 21 giants can generate 3.9 gigawatts.