What begins with T, ends with T, and has T in it?

Can you solve the below tricky visual equation?

I have Rs.50 and I spend it in the way as below.

Can you count the number of triangles in the picture below?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What Deficiency does the below rebus represent?

VIT_MIN

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

When is the top of a mountain similar to a savings account?