Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Solve the mathematical equation in the picture below.

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

There is a basket full of hats. Three are white and two are black. Three men, Tom, Tim, and Jim, each take a hat out of the basket and put it on their heads without seeing the hat they selected or the hats the other men selected. The men arrange themselves so Tom can see Tim and Jim’s hats, Tim can see Jim’s hat, and Jim can’t see anyone’s hat. Tom is asked what color his hat is and he says he doesn’t know. Tim is asked the same question, and he also doesn’t know. Finally, Jim is asked the question, and he does know. What colour is his hat?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

When can we add 2 to 11 and get 1 as the correct answer?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??