Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Solve the maths equation in the picture below by placing the numbers 1 through 9 into the boxes so that all the 3 equations are correct.

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

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

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Find the next number in the series below

21 32 54 87 131 ?

You are in a dark room and want to see what is inside it. With you are a match, a candle, and a kerosene lamp. Which do you light first?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

I know a number which is spelt in alphabetical order.
Do you?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?