Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Solve the rebus riddle in the picture below.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Can you place three balls such that the equation shown in the picture holds true?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

James Bond is caught up in a mysterious scenario where the evil villain has him blindfolded. He somehow breaks through the handcuffs but is unable to get the blindfold off. Upon searching, he comes across a bow and 3 arrows. He can hear the villain speak, and thus tries to take a shot at him. He launches the first arrow, it misses the villain. He then launches the second arrow and it misses by a greater margin.

What is the probability that this third shot our James bond takes will be worse than the second shot?

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

How can this be possible?