Verbal Reasoning - Mental Ability Questions

If 3*1 = 20, 6*1 = 50 and 2*6 = -40, then find the value of 5*8 = ?

If A denotes '+', B denotes '­', C denotes 'x' and D denotes '÷', then which of the following statement is true?

Deepak starts walking straight towards east. After walking 75 metres, he turns to the left and walks 25 metres straight. Again he turns to the left, walks a distance of 40 metres straight, again he turns to the left and walks a distance of 25 metres. How far is he from the starting point?

Rahul walks 30 metres towards south. Then turns to his right and starts walking straight till he completes another 30 metres. Then again turning to his left he walks for 20 metres. He then turns to his left and walks for 30 metres. How far is he from his initial position?

In the following question, correct the equation by interchanging the two signs.
6 ÷ 17 x 51 + 6 – 12 = – 4

If M is the sister of Z , Z is the wife of P and P is the son of A, how Z relates to A?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
efg _ _ eff _ ghhe _ eff _ gggh _ h

Pointing to a photograph of a lady, Vishal says, "She is the sister­in­law of my grandfather's daughter". How is the lady in the photograph related to Vishal?