Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?

Where do you go to learn how to make ice cream?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Which Burger Is Different in below image?

I have eight fingers and two thumbs but I do not live. What Am I?