I’m tall when I’m young, and I’m short when I’m old. What am I?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Can you count the number of squares in the given picture?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

How far can you walk into the woods?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?