How do you go from 98 to 720 using just one letter?

What is the Surname of Barbie Doll?

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What is the fastest way to double your money?

What does the below rebus riddle means?

How can you tell a raw egg from a hard-boiled egg?

What can you deduce from the following BrainBat?

CRY
LMKI

By using 'because' continuously three times, can you make an English statement ?