Can you identify the hidden rebus in the image below?

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

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

You can hear me, but you can't touch or see me.

What am I?

How do you go from 98 to 720 using just one letter?

Spot 5 differences in two Christmas tree below:

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What kind of storm is always in a rush?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

How many times can you subtract the number 5 from 25?