Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

What does this below rebus puzzle mean?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Find the next number in the sequence

1, 2, 6, 21, 88, __?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

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

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___