Recent Riddles & Brain Teasers

Four friends are sitting on a tree. Each one of them is wearing a hat. They don't know which coloured hat are they wearing but they do know that two of them have green hats and two of them have orange hats.

Adam is sitting on the top branch and he can see the hats of Billy and Cyrus. Billy is sitting on a branch above Cyrus and he can see Cyrus hat. Duke is sitting at the base of the tree. Branches are covering him fully and no one can see his hat.

Now they are not allowed to look upwards. Who do you think will shout the colour of his hat first?

Find the missing number in the series below

13 -21 34 -55 ? -144

How many triangles do you see in the picture puzzle below?

You need to remove four matchsticks from the picture below and still need to maintain the following as in the original image.
1. 1st row contains 12 matchsticks
2. 2nd row contains 12 matchsticks
3. 1st column contains 12 matchsticks
4. 2nd column contains 12 matchsticks

Which of the eight images will fill the missing image in the puzzle below?

Can you find the next number in the sequence?

113 119 101 114 116 ?

Find the value of "a" by solving the maths equation in the picture below:

Before Balboa discovered the Pacific Ocean, which was the largest ocean before that?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.