I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Prove that the below maths equation is true.

8 + 8 = 91

What is the Surname of Barbie Doll?

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

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

I have branches, but no fruit, trunk or leaves. What am I?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?