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

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

I’m tall when I’m young, and I’m short when I’m old. What am I?

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

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

You can see it everyday, But cannot touch it at will. What is it?

If six children and two dogs were under an umbrella, how come none of them got wet?