What does this mathematical rebus means ?

what does the below rebus means?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

How many Watermelons are there in the below picture?

Can you write down eight eights so that they add up to one thousand?

What work can one never finish?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?