When we see 2 but call 10?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

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

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?