I have Rs.50 and I spend it in the way as below.

John was piloting a plane behind a car but was never able to overtake it. Why?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

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

Can you write down eight eights so that they add up to one thousand?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?