If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Solve this riddle by finding the odd one out from the rest.

If we tie a Sheep to one peg, a circled grass is been eaten by the Sheep. If we tie the Sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the Sheep. If we want an eclipse then we put two pegs and then put a rope in between them and the other end of the rope is tied up on the Sheep's neck.

How should we tie the peg and the Sheep so that a square is eaten out from the garden grass? We only have one Sheep rope and the peg and the rings.

Chocolate costs 6 rupees and a Toy costs 5 rupees. If you have 32 rupees in total, how many chocolates and how many Toys can be purchased with that amount?

By what process could you make a 'Tea-Table' into food?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?