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

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

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

Find the missing letter in the last circle logically in the given below picture.

what does this picture(rebus) riddle means ?

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

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

Which is heavier: a ton of bricks or a ton of feathers?

Which five letter word can be added at the end of below word to form a
valid word?

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What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Identify The phrase in the picture.