What number should come in place of the question mark below?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

If you say my name, I will no longer exist. What am I?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?