We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

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

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

What does this rebus photo means?

The dirtier I get, the whiter I look. Who am I?

Find the next number in the series below

21 32 54 87 131 ?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

How many times can you subtract the number 5 from 25?