With the help clues provided in the image, can you find the 5 digit key?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

When is the top of a mountain similar to a savings account?

Out of four images which one is the odd one out?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211