What does this Rebus Picture mean?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Why is a river so rich ?

In which direction should the missing arrow point?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Can you replace the question mark with the correct number in the below table sequence?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

A research team went to a village somewhere between the jungles of Africa. Luckily for them, they reached the day when quite an interesting custom was to be performed. The custom was performed once a year as they confirmed and was performed in order to collect the taxes from every male of the region.

The taxes were to be paid in the form of grains. Everyone must pay pounds of grain equaling his respective age. This means a 20-year-old will have to pay 20 pounds of grain and a 30-year-old will pay 30 pounds of grain and so on.

The chief who collects the tax has 7 weights and a large 2-pan scale to weigh. But there is another custom that the chief can weigh only three of the seven weights.

Can you find out the weights of the seven weights? Also, what is the maximum age of the man that can be weighed for the payment of taxes?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?