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

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

What brings you down but never up?

Which is the rope you never skip with?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Replace the question mark with the correct number in below Picture:

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

They are three errirs in this question. Can you find them?

what does the below rebus mean?

What does this below rebus puzzle mean?

What jumps when it walks and sits when it stands?