What happened when the wheel was invented?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

Can you make four (4) nines (9) equal 100?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

What does this rebus mean?

O
N
C
E
TIME

What does below Rebus mean ?

esgg sgeg gegs gsge

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

Be active and find the killer in the picture Riddle below.

Identify the hidden meaning behind this picture?