What does below chemistry rebus means?

How many triangles are there in the picture below?

What goes up but never comes down?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

Solve the rebus riddle in the picture below.

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?

What you cannot hold but it is yours?

Which city is three-fifths chick two third cat and 50% goat?