What happened when the wheel was invented?

Find the next number in the sequence

5 12 24 36 ?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

How many times can you subtract the number two from the number fifty?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

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