Count the number of lines in the image below ?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Count the Triangle in the figure given below:

Can you name four days which start with the letter 'T'?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Can you place six X (crosses) in below board without making three in a row in any way ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Can you make a six-letter word using the letters N, A and B ?

A blonde put eyeliner on her head. Why?

Which English verb becomes past tense just by rearranging the letters?