Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

Find the next number in the sequence

5 12 24 36 ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

What's a single-digit number with no value?

What does a man do only once in his lifetime, but women do once a year after they are 29?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Which is faster, Heat or Cold ? Explain.