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

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

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

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

What does this rebus picture identify?

With the help clues provided in the image, can you find the 5 digit key?

Solve the counting riddle by identifying the number of triangles in the given picture.