I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Can you spot the hidden girl in the picture below?

Before Mount Everest was discovered, what was the highest mountain in the world?

Name a key which is hardest to turn.

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Find the number of squares in the below picture

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

What is the fastest way to double your money?