How many sides does a circle have?

I am sure no one can have two things for dinner. what are they?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I taste better than I can smell. Who am I?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

Count the number of balls in picture below:

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

Find the missing number in the sequence below: