Verbal Reasoning - Mental Ability Questions

If S means '+', L means 'x', U means '/' and K means '-', then the value of

21 S 1 U 7 L 15 U 6 L 14 K 55

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

Select the related word/letters/number from the given alternatives.

432 : 9 : : 237 : ?

 In the following question, select the related word pair from the given alternatives.

Truck : Vehicle : : ? : ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

24 + 4 - 20 ÷ 9 x 5 = 31

There is a family of six persons A, B, C, D, E and F. They are Lawyer, Doctor, Teacher, Salesman, Engineer and Accountant There are two married couples in the family. D, the Salesman is married to the Lady Teacher. The Doctor is married to the Lawyer. F, the Accountant is the son of B and brother of E. C, the Lawyer is the daughter-in-law of A. E is the unmarried Engineer. A is the grandmother of F. How is E related to F? 

In the following question, select the related letter/letters from the given alternatives.

CEG : IKM : : FHJ : ?

In the following question, select the related word pair from the given alternatives.

Flag : Nation : : ? : ?