What has lots of eyes, but can’t see?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

Who always enjoys poor health?

I always drive my customer away.

Who am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?