Verbal Reasoning - Mental Ability Questions

If + means /, / means -, - means x, x means +, then 10 + 5 / 7 - 4 x 30 = ?

A woman while shopping in a mall pushes her trolley 20 metres through an alley which is going East, then she turns to her left and walks 30 metres, then she turns West and walks another 30 metres, then she turns South and walks 30 metres and then she turns West and walks 25 metres. Where is she now with reference to her starting position?

In a certain code language, “PILOW” is written as “49352” and “TRAIN” is written as “78691”. How is “PRAWN” written in that code language?

A study published in PLOS Medicine found that obesity was the cause of 1 in 10 deaths in the United States. Also, obesity was the third-leading cause of death in men and women, after high blood pressure and smoking. Hence, many doctors believe that it’s high time obesity be placed in the category of serious diseases as it not only decreases life expectancy but also impairs the normal functioning of the body.
Which of the following statements, if true, undermines the given argument?

From the given alternative words, select the word which cannot be formed using the letters of the given word:

PREDICAMENT

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

t_vw_u_w_uvw

If the mathematical operator '+' means '÷', '-' means '+', '÷' means 'x' and 'x' means '-', then the value of 17 - 7+ 27 + 3 x 79 is

The weights of 4 boxes are 20, 40, 80 and 90 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?