Replace the question mark with the correct number in the below-given picture?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

Bay of Bengal is in which state?

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?

Count the Triangle in the figure given below:

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Can you divide the below-given shape into four equal and identical pieces?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.