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

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

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

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

Move four matchsticks to the below square to form three squares?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

The dirtier I get, the whiter I look. Who am I?

After teaching his class all about Roman numerals (X = 10, IX=9 and so on) the teacher asked his class to draw a single continuous line and turn IX into 6. The teacher's only stipulation was that the pen could not be lifted from the paper until the line was complete.

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

What four weights can be used to balance from 1 to 30 pounds?