I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

I am an odd number. Take away a letter and I become even. What number am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.