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?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

I know a nine-letter word having only one vowel.
Do you ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What Deficiency does the below rebus represent?

VIT_MIN

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?