GMAT Quantitative Reasoning Practice Test 3

Question : 58 of 100

Marks: +1, -0

A windmill is taking advantage of strong air currents in order to produce electrical energy. On a typical day the wind speed is around 20 mph and in that speed the windmill produces 800 kw/h (kilowatts per hour). On a stormy day a windmill produces 20% more energy. How much kw/h can three windmills produce in two hours on a stormy day?

2880
4860
5780
5760
6380

Validate

Solution:

On a stormy day, a windmill will produce 20% more energy. 20% of 800 is 160, so each windmill will give out 960 kw/h. Three windmills will give

3 × 960 = 2880

, but we want two hours so the answer is

2880 × 2 = 5760.

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