Verbal Reasoning - Mental Ability Questions

If 20&60 = 8, 40&80 = 12 and 10&20 = 3, then find the value of 20&50 = ?

If 40@8 = 50, 30@3 = 100 and 10@2 = 50, then find the value of 20@5 = ?

Rahul told Anand, 'Yesterday I defeated the only brother of the daughter of my grandmother.' Whom did Rahul defeat 

In the following question, select the missing number from the given series.

13, 17, 19, 23, 29, ?

A man pointing to a photograph says, 'The lady in the photograph is my nephew's maternal grandmother." How is the lady in the photograph related to the man's sister who has no other sister ?  

In the following question, select the missing number from the given series.

567, 189, 63, ?, 7

Manoj, Prabhakar, Mash and Kamal are four friends. Who among them is the heaviest ''

I. Prabhakar is heavier than Manoj and Kamal but lighter than Akash. 

II.Manoj is lighter than Prabhakar and Mask but heavier than Kamal. 

MABELA, MABLE, MABUSE, MABEPEARL, ?

If the above given words are arranged in the dictionary then the last word is